mineral

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock

Quartz: Hardness 7 (Mohs scale), milky white to translucent color, vitreous luster, hexagonal crystal system (though massive/microcrystalline here), conchoidal fracture. Host rock: Dull luster, fine-grained, grey-green color.

Identified April 1, 2026More mineral →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Formed through hydrothermal processes where mineral-rich hot water circulated through cracks (veins) in existing host rock, precipitating quartz as it cooled. This specific specimen shows a contact zone between a quartz vein and the surrounding rock.

Uses & applications

Quartz is used in glassmaking, electronics (piezoelectric properties), abrasives, and as semi-precious gemstones. This specific raw specimen is primarily for amateur collecting or decorative use.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Vein quartz like this often serves as a primary indicator for gold prospectors, as gold is frequently found within these hydrothermal systems.

Field identification & locations

Identify by its ability to scratch glass (Hardness 7) and its lack of cleavage. Look for the sharp contrast between the light mineral and the darker, fine-grained host material. Commonly found in stream beds and mountainous regions where erosion has exposed old mineral veins.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

mineral