Garnet (Industrial Abrasive)

What garnet (Industrial Abrasive) actually is

The species behind garnet (Industrial Abrasive) is crushed and graded almandine or andradite garnet, used as a cutting and blasting abrasive because it fractures to fresh sharp edges and is low in free silica, Almandine Fe3Al2(SiO4)3, with andradite Ca3Fe2(SiO4)3 in some deposits; it forms in the cubic (supplied as crushed aggregate) system.

Deep red-brown; colour is irrelevant to the application, mesh size and friability are what matter is responsible for the colour — and the chromophore, not the name, is what decides whether a colour is stable.

On the instruments it reads a refractive index of 1.77-1.83 (almandine) and a specific gravity of about 3.90-4.30, with none; parting and conchoidal fracture cleavage.

Where garnet (Industrial Abrasive) comes from

Commercial material comes from Gore Mountain, Warren County, New York, USA (Barton Mines - hard rock almandine), Port Gregory and Lucky Bay, Western Australia (GMA Garnet - alluvial, the dominant world supplier), Tamil Nadu and Odisha beach sands, India and Jiangsu and Inner Mongolia, China.

Different localities give different colour and different clarity, and the trade prices them differently. We state which one.

How garnet (Industrial Abrasive) is treated

Crushed, washed, dried and screened to mesh grades (80 mesh is the waterjet standard). Chosen over silica sand specifically because it is low in crystalline silica, so it does not cause silicosis the way sand blasting does - that is its main occupational-health selling point, and a regulatory driver in the EU and Australia where silica sand blasting is banned or restricted. Recyclable through several cutting passes. Indian beach-sand garnet has faced export restrictions and mining-licence disputes.

We state the treatment on every stone, including when the honest answer is that it cannot be determined. A treatment disclosed is a fact; a treatment discovered later is a refund.

What garnet (Industrial Abrasive) is confused with

Watch for Silica sand (cheaper, but a silicosis hazard), Staurolite sand, Manufactured aluminium oxide and Coal and copper slag abrasives — these are what turn up sold under this name.

The separation is rarely a matter of opinion: refractive index 1.77-1.83 (almandine) and specific gravity 3.90-4.30 settle most of it in a minute, and magnification settles the rest.

What garnet (Industrial Abrasive) is used for

The trades that buy garnet (Industrial Abrasive) are abrasives and heavy industry. They do not want the same thing, and they do not pay in the same unit.

We quote each application in the unit that trade actually buys in, by the tonne.

Durability and care

Hardness 7-8; cleavage none; parting and conchoidal fracture. That combination decides what it can safely be set into.

With no cleavage plane to worry about, the practical limit is abrasion rather than breakage, and it takes daily wear well.

Warm water, mild soap and a soft brush. Avoid ultrasonic cleaners on anything fracture-filled, stabilised, dyed or visibly included.

What garnet (Industrial Abrasive) costs

Expect roughly Approximately $170 per tonne average US import unit value (USGS, 2025); bagged waterjet grades $300-600 per tonne retail, depending on quality.

That is a range, not a quote. Colour, size, clarity, cut and origin move the figure a long way inside it, and the only honest price is one given against a specific stone. Send us what you need and we will price it.

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