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Posted by Admin on July, 14, 2026
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What Are High Whiteness Albite Lumps — and Who Supplies Them?
The 5 markers of genuinely high whiteness albite lumps:
- Verify Fe₂O₃ below 0.08-0.10% — the single largest factor separating "white" claims from actually white-firing material.
- Check TiO₂ below 0.02-0.025% — titanium causes a grey-blue tint that iron testing alone will not catch.
- Demand ISO brightness above 85-90% in the COA — the verifiable optical number, not a visual description.
- Confirm Na₂O 9.5-11% is maintained — whiteness selection should not come at the cost of flux value in the ore.
- Request consistent lump size grading (e.g., 10-40mm, 40-80mm), low fines content, and a NABL-accredited XRF COA on every shipment.
Source: Aalok Overseas Technical Laboratory, Rajasthan, India · Manufacturer & Exporter of High Whiteness Albite Lumps to 50+ Countries Since 1992 · www.feldsparindia.com
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AALOK OVERSEAS INDIA · RAJASTHAN · FELDSPAR DIVISION · PRODUCT GUIDE
Ultra Low Iron · Low Titanium · ISO Brightness 85-90% · Na₂O Retained · Graded Lump Size · NABL COA · Glass, Frit & Grinding-Unit Grade · 50+ Countries · Exporter Since 1992
Published: July 2026 | Author: Aalok Overseas Technical Team | Category: Ceramic & Industrial Raw Materials
REQUEST HIGH WHITENESS LUMPS SAMPLE → VIEW FULL SODIUM FELDSPAR SPECSWhat Are High Whiteness Albite Lumps — and Why Does It Matter?
Albite Lumps are the run-of-mine, unground form of sodium feldspar (albite, NaAlSi₃O₈), supplied as sorted rock rather than powder to buyers — glass manufacturers, frit producers, and large ceramic groups — who operate their own crushing, grinding, and mesh-grading lines and prefer to control final particle size in-house. Because lumps are inspected and priced before that grinding investment happens, whiteness and purity verification at the lump stage is arguably more critical than for pre-ground powder: any iron-oxide-stained rock, mica inclusion, or dark accessory mineral that slips past sorting goes straight into the buyer's mill and shows up in every batch ground from that lot. High whiteness albite lumps are hand-sorted and screened specifically to exclude these visible and chemical impurities before shipment.
High Whiteness Requirements by End Use
| END USE | FE₂O₃ CEILING | ISO BRIGHTNESS REQUIRED | TYPICAL LUMP SIZE |
|---|---|---|---|
| Clear Container & Sheet Glass Furnace Charge | <0.05% | 90%+ | 10-40mm |
| Enamel Frit Manufacturing | <0.06% | 89-92% | 10-40mm |
| In-House Grinding — Premium Glaze/Porcelain | <0.08% | 87-90% | 10-80mm |
| In-House Grinding — Export Vitrified Tile | <0.10% | 85-88% | 10-80mm |
| Ceramic Frit & Fast-Fire Glaze Feed | <0.08% | 87-90% | 10-40mm |
| In-House Grinding — Standard Wall Tile | <0.15% | 82-85% | 40-80mm |
8 Markers of Genuinely High Whiteness Albite Lumps — What to Verify Before You Buy
MARKER 01 — MOST IMPORTANT
Fe₂O₃ Below 0.08-0.10% — The Whiteness Ceiling
Iron oxide is the dominant impurity responsible for cream, buff, or yellow tinting once lumps are ground into powder. Standard-grade albite lumps commonly run Fe₂O₃ 0.15-0.25% due to incomplete sorting, which is acceptable for standard wall tile grinding but visibly limits brightness for glass and premium glaze use. Genuinely high whiteness albite lumps hold Fe₂O₃ below 0.08-0.10%, and Aalok Overseas' glass-furnace grade below 0.05%.
MARKER 02 — OFTEN OVERLOOKED
TiO₂ Below 0.02-0.025% — The Impurity Visual Sorting Misses
Titanium dioxide produces a grey-blue undertone that is not always visible on the rough, weathered surface of raw lumps and is easy to miss during hand-sorting if a supplier relies on visual inspection alone. Buyers who accept lumps on appearance alone can still receive material that grinds dull because titanium was never chemically verified. High whiteness albite lumps specify TiO₂ below 0.02-0.025% via lab testing, not sorter judgment.
MARKER 03 — VERIFIABLE METRIC
ISO Brightness Above 85-90%
ISO brightness testing on a representative crushed and ground sample from the lump lot is the number that actually predicts how white the buyer's own ground output will be — far more reliable than judging raw lump colour by eye. Genuinely high whiteness albite lumps report ISO brightness of 85% or higher on this representative sample, with glass-furnace grades reaching 90%+.
MARKER 04 — FLUX VALUE RETAINED
Na₂O Maintained at 9.5-11%
Whiteness selection should not come at the cost of the Na₂O flux value that makes albite valuable as a raw material for glass and ceramic melts in the first place. Aggressive sorting that removes every slightly tinted rock can sometimes also remove feldspar-rich pieces alongside genuinely low-grade waste rock if not done carefully. High whiteness albite lumps are sorted to remove impurity, not feldspar content, keeping Na₂O in the same 9.5-11% range as standard grades.
MARKER 05 — CONSISTENCY
Consistent Lump Size Grading with Low Fines Content
Lump size consistency matters for a buyer's crusher and mill feed rate and energy efficiency — oversized boulders or excessive fines both disrupt a grinding line's throughput. High whiteness albite lumps are screened to a stated size band (commonly 10-40mm or 40-80mm) with fines content held below a specified percentage, consistent shipment to shipment.
MARKER 06 — HANDLING QUALITY
Low Surface Moisture and Contamination
Lumps stored or transported without proper cover can pick up surface moisture, clay contamination, or mixed debris from stockpile handling — all of which affect both weight-basis quality and the purity of the buyer's ground output. High whiteness albite lumps are sourced and stored under controlled conditions to keep contamination and moisture pickup to a minimum.
MARKER 07 — DOCUMENTATION
NABL-Accredited XRF COA on Representative Crushed Sample, Per Shipment
A lump COA is only meaningful if it is run on a properly representative crushed-and-ground sample of the lot, not a single hand-picked "best" rock. Genuine high whiteness albite lumps come with a NABL-accredited COA reporting Fe₂O₃, TiO₂, Na₂O, and ISO brightness from a representative sample on every shipment.
MARKER 08 — SUPPLY RELIABILITY
Mine-Direct Extraction with Trained Manual and Optical Sorting
High whiteness lump grading depends on skilled sorting at the point of extraction — traders re-selling stockpiled or blended lumps from multiple sources cannot guarantee the same sorting standard shipment to shipment. Mine-direct manufacturers like Aalok Overseas control extraction, sorting, and screening in-house, which is what makes repeatable high whiteness lump quality possible at scale.
High Whiteness Albite Lumps Sourcing Problem — Symptom → Cause → Fix
| SYMPTOM OBSERVED | PROBABLE CAUSE | RECOMMENDED FIX |
|---|---|---|
| Ground powder duller than lump appearance suggested | Fe₂O₃/TiO₂ verified visually, not by lab test on ground sample | Demand ISO brightness on a representative crushed sample, not raw lump inspection |
| Occasional dark, iron-stained rock found in shipment | Incomplete hand-sorting at source | Specify maximum tolerance for visibly impure rock in supply contract |
| Grinding line throughput inconsistent shipment to shipment | Inconsistent lump size grading or excess fines | Specify size band (e.g., 10-40mm) and maximum fines percentage |
| Flux performance weaker than expected from "high grade" lumps | Over-aggressive sorting removed feldspar-rich material along with waste | Verify Na₂O 9.5-11% is maintained alongside whiteness spec |
| Weight-basis quality lower than invoiced | Surface moisture or clay contamination from uncovered stockpiling | Request covered storage/handling and moisture content in COA |
| Sample lot excellent; bulk shipment noticeably duller | Sample ≠ bulk lot — no per-shipment representative testing | Demand NABL COA with ISO brightness on every shipment, not one-time sample |
Aalok Overseas High Whiteness Albite Lumps — Available Grades
High Whiteness Albite Lumps — Standard Grinding Grade
Sorted for export-grade in-house grinding lines producing vitrified and premium wall tile bodies, offering a clear step up in brightness over standard-grade lumps without any loss of Na₂O flux value.
Na₂O 9.5-10.5% · Fe₂O₃ <0.10% · TiO₂ <0.025% · ISO Brightness 85-87% · 10-80mm · NABL COA
High Whiteness Albite Lumps — Premium Frit & Glaze Grade
Tighter iron and titanium control combined with a finer, more consistent size band, engineered for enamel frit production and premium glaze grinding lines where visible whiteness is a quality-inspection criterion.
Na₂O 10.0-11.0% · Fe₂O₃ <0.08% · TiO₂ <0.02% · ISO Brightness 87-90% · 10-40mm · NABL COA
Ultra White Albite Lumps — Glass Furnace Grade
Our lowest iron and titanium formulation, hand-sorted specifically for container and sheet glass furnace charge where colour purity in the final melt is the single most important specification.
Na₂O 10.0-11.0% · Fe₂O₃ <0.05% · TiO₂ <0.015% · ISO Brightness 90%+ · 10-40mm · NABL COA
Why Mine-Direct, Hand-Sorted Extraction Makes the Difference
Aalok Overseas has operated its own dedicated mine sources in Rajasthan since 1992. High whiteness lump grades are not achieved by re-sorting stockpiled material from multiple traders — they come from skilled manual and optical sorting at the point of extraction, followed by controlled screening to size band and covered storage to prevent contamination. This is why our high whiteness Na₂O, Fe₂O₃, TiO₂, and ISO brightness figures — verified on a representative ground sample — stay within a tight band shipment after shipment. Consistency is the whiteness guarantee behind every load.
Aalok Overseas — High Whiteness Albite Lumps Specification Reference
| GRADE | NA₂O | FE₂O₃ | TIO₂ | SIO₂ | ISO BRIGHTNESS | LUMP SIZE | END USE |
|---|---|---|---|---|---|---|---|
| Standard Grinding Grade | 9.5-10.5% | <0.10% | <0.025% | 65-68% | 85-87% | 10-80mm | Wall Tile · Vitrified Tile Grinding |
| Premium Frit & Glaze Grade | 10.0-11.0% | <0.08% | <0.02% | 66-69% | 87-90% | 10-40mm | Frit · Premium Glaze Grinding |
| Ultra White Glass Furnace Grade | 10.0-11.0% | <0.05% | <0.015% | 66-69% | 90%+ | 10-40mm | Container & Sheet Glass Furnace |
All grades: NABL XRF COA on representative crushed sample with ISO brightness · MSDS · Certificate of Origin · Free sample — 48hr dispatch · FOB Mundra / Kandla · Export to 50+ countries
FAQ — High Whiteness Albite Lumps
Q
What makes albite lumps "high whiteness"?
High whiteness albite lumps are sodium feldspar ore hand-sorted and screened to hold Fe₂O₃ below 0.08-0.10% and TiO₂ below 0.02-0.025%, verified by ISO brightness above 85-90% on a representative ground sample, while maintaining Na₂O 9.5-11% so flux value is not sacrificed for whiteness.
Q
What is the difference between albite lumps and sodium feldspar powder?
Albite lumps are the unground, raw ore form of sodium feldspar, sold to buyers who operate their own crushing and grinding lines and want to control final particle size in-house. Sodium feldspar powder is already ground and mesh-graded by the supplier. Lumps typically cost less per tonne but require the buyer to have grinding capacity.
Q
Why is ISO brightness on a ground sample more reliable than judging raw lump colour?
Raw lumps have a weathered, uneven surface that can hide iron staining or titanium-bearing inclusions, or conversely make a lump look duller than its actual ground colour. ISO brightness testing on a representative crushed and ground sample predicts the buyer's actual mill output far more accurately than visual inspection of the rock.
Q
Does sorting for whiteness reduce the Na₂O flux value of the lumps?
It shouldn't, if sorting is done to remove genuinely impure rock rather than aggressively over-sorting. Careless sorting can sometimes strip out feldspar-rich pieces alongside waste rock, reducing Na₂O. Genuine high whiteness albite lumps maintain Na₂O 9.5-11%, the same range as standard grinding-grade lumps.
Q
What lump size should I order for my grinding line?
10-40mm is standard for glass furnace charge, frit production, and premium glaze grinding lines that use finer crushers. 10-80mm is common for standard vitrified and wall tile grinding lines with coarser primary crushing capacity. Confirm your mill's feed size requirement before ordering.
Q
How do I verify a supplier's high whiteness lump claim before ordering in bulk?
Request a free sample lot, crush and grind a representative portion yourself (or have the supplier do so under observation), and test Fe₂O₃, TiO₂, Na₂O, and ISO brightness on that ground sample — not the raw lump. Compare the result to your reference standard before committing to bulk order.
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REQUEST HIGH WHITENESS LUMPS SAMPLE · NABL COA · FE₂O₃, TIO₂ & ISO BRIGHTNESS REFERENCE DATA
Contact Aalok Overseas — India's High Whiteness Albite Lumps Specialist
Request free samples of High Whiteness Albite Lumps Standard Grinding Grade, Premium Frit & Glaze Grade (Fe₂O₃ <0.08%), or Ultra White Glass Furnace Grade (Fe₂O₃ <0.05%, ISO Brightness 90%+) — with NABL-certified COA on a representative ground sample, and MSDS. Verified whiteness, not just a claim.
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