Lumps
Snow-white and glassy lumps, sorted by colour and purity.
For glass · silicon metal · ferro-silicon
Our minerals
Quartz
Lumps · grits · powder
Natural quartz from India, for buyers in China
FormsLumps, grits and powder
Every lotTested, with its own lab report
ShippedFrom Indian ports to China
What it is
Pure, Hard and Clear
Quartz is silica (silicon dioxide, SiO₂), one of the most common minerals in the earth's crust.
It is hard (7 on the Mohs scale), stands heat, and resists almost every chemical. The purer the quartz, the more it is worth: the purest grades become glass, silicon and solar cells. Coast Origin supplies it in three forms, sorted and graded to each buyer's order.
Forms we supply
Three Forms, One Source
Each form is sorted and graded to the buyer's order. Tell us what your process needs, and we match the grade.
Grits & chips
Quartz crushed and screened into even sizes.
For engineered stone · ceramics · flooringPowder
Quartz ground to a fine flour, to the mesh you need.
For ceramics & glazes · glass · paints · rubberGrades and sizes: lumps from 10 to 300 mm, grits and chips from 0.1 to 10 mm, and powder from 200 to 325 mesh, all to your order.
Specifications
Tested on Every Lot
These are the measurements in a quartz lab report. Coast Origin's own values go here from its reports, and every lot you buy comes with a report of its own.
Values: from Coast Origin's lab reports
| Measure | Usual method | Coast Origin |
|---|---|---|
| Silica SiO₂, % | XRF | — |
| Iron oxide Fe₂O₃, % or ppm | XRF or ICP | — |
| Alumina Al₂O₃, % | XRF | — |
| Titania TiO₂, % or ppm | XRF or ICP | — |
| Lime CaO, % | XRF | — |
| Magnesia MgO, % | XRF | — |
| Potash K₂O, % | XRF | — |
| Soda Na₂O, % | XRF | — |
| Loss on ignition % | Heating to 1,000 °C | — |
| Measure | Usual method | Coast Origin |
|---|---|---|
| Whiteness % | Whiteness meter | — |
| Moisture % | Drying at 105 °C | — |
| Size mm (lumps, grits) or mesh (powder) | Sieve | — |
| Colour snow-white or glassy (lumps) | Visual | — |
XRF (X-ray fluorescence) is the standard laboratory test of a mineral's chemistry. In very pure quartz, iron and other traces are measured in parts per million (ppm) by ICP.
Quality & lab
Checked Before It Ships
You see the results before you buy, not after.
- 01Sample
A sample is taken from every lot.
- 02Test
A laboratory measures its chemistry, size and moisture.
- 03Report
The results go into a lab report that carries the lot number.
- 04Your approval
You get the sample and its report before you order. An independent inspection at loading can be arranged on request.
Lab reportQuartz lumps · PDF from Coast Origin
Lab reportQuartz powder · PDF from Coast Origin
Uses
Where Quartz Goes to Work
From a bottle to a solar cell. These are the main industries that buy it.
Glass
Container, flat and speciality glass: the purer the quartz, the clearer the glass.
Solar & silicon
High-purity quartz is the starting point for silicon metal, solar cells and chips.
Ferro-alloys
Lumps are smelted into ferro-silicon, used in making steel.
Ceramics & tiles
Silica gives tiles, sanitaryware and glazes their strength and whiteness.
Engineered stone
Grits bound with resin become quartz worktops and surfaces.
Foundry & refractories
Heat-resistant sand and bricks for moulds and furnaces.
In pictures
From Mine to Ship
How quartz is quarried, sorted, graded and packed for export. The photographs are illustrative.
Packing & shipping
Packed for the Sea
Packed, documented and shipped from Indian ports to your port in China.
Packing1-tonne jumbo bags or 50 kg bags, or loose in the container
Price termsFOB or CIF, as you prefer
Shipped fromAn Indian port, named in each quotation
Lead timeConfirmed with each order
Documents
Papers That Travel With It
With every shipment
- Lab report (certificate of analysis) for each lot
- Commercial invoice
- Packing list
- Certificate of origin
- Bill of lading
Company registrations
- Export registration (IEC) copy on request
- GST registration copy on request
- Mining lease or licence copy on request
- Independent inspection on request
Bulk enquiry
Ask for a Sample
Ask for a Sample
and a Price
Tell us the form, grade and quantity you need. We'll come back with a sample, its lab report and a price.
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