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Buying guide

Quartz

Quartz is valued for size, clarity and crystal form rather than rarity. For specimens, an undamaged termination and good matrix presentation matter more than weight.

Quartz at a glance

Mineral family
Quartz
Chemical formula
SiO2
Mohs hardness
7
Refractive index
1.544 - 1.553
Specific gravity
2.65
Crystal system
Trigonal
Colours
colourless, smoky, brown
Birthstone month
April
Anniversary
,
Typical treatment
Clear quartz is untreated. Some smoky quartz is irradiated to deepen colour.
In stock now
2 stones from $84.00

What drives the price

Quartz is valued for size, clarity and crystal form rather than rarity. For specimens, an undamaged termination and good matrix presentation matter more than weight.

In one line: Crystal form and termination quality, clarity, size.

Treatment

Clear quartz is untreated. Some smoky quartz is irradiated to deepen colour.

Any seller unwilling to state treatment in writing is telling you something. Every listing on this site states it.

Durability and daily wear

Very easy. Warm soapy water. Smoky quartz colour can fade with intense prolonged sunlight.

Mohs 7, trigonal crystal system, specific gravity 2.65.

Tradition and meaning

Clear quartz is the master amplifier and programmable stone. Smoky quartz grounds and clears dense energy.

Birthstone for April. Associated with All. Anniversary stone: , .

Frequently asked

What makes a good clear quartz specimen?

An undamaged point, good transparency, and an attractive relationship between crystal and matrix. Chips on the termination reduce value sharply even on large pieces.

Is smoky quartz irradiated?

Some is. Natural smoky quartz forms through geological irradiation of aluminium-bearing quartz over millions of years; commercial treatment simply accelerates the same process, and the result is stable and safe.

Why is quartz used in so many crystal practices?

It is abundant, forms in clear well-terminated crystals, is hard enough to handle daily, and is inexpensive at collector sizes, a rare combination that made it the default working stone.

Quartz in stock

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