mineral

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

The small specimen appears pale purple to lavender with translucent crystalline areas, consistent with amethyst-bearing quartz. Quartz has Mohs hardness 7, a vitreous luster, hexagonal crystal structure, and no cleavage; the image is too small to confirm its exact variety or properties.

Identified September 25, 2026More mineral →

Explore Quartz crystal cluster in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Quartz crystallizes from silica-rich fluids in cavities and veins; amethyst coloration commonly develops through trace iron and natural irradiation. Quartz occurs in rocks of many ages, so the specimen’s age and locality cannot be determined from the image.

Uses & applications

Quartz is used in glass, electronics, and ornamental objects; amethyst is also cut for jewelry and collected as mineral specimens.

Geological facts

Amethyst is the purple variety of quartz; its color can fade with prolonged heat or strong sunlight.

Field identification & locations

Look for glassy luster, hardness near 7, and six-sided crystal forms; common sources include Brazil, Uruguay, and parts of Africa. The display and image do not provide enough detail to verify the identification or locality.