mineral

Quartz with impurities or Host Rock

SiO2 (Silicon Dioxide) with mixed silicates

Hardness 7 (for quartz), white/translucent to grayish/greenish color, vitreous luster on fresh surfaces, massive crystal structure in this specimen, conchoidal fracture, specific gravity ~2.65

Identified June 9, 2026More mineral →

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Physical properties

Hardness 7 (for quartz), white/translucent to grayish/greenish color, vitreous luster on fresh surfaces, massive crystal structure in this specimen, conchoidal fracture, specific gravity ~2.65

Formation & geological history

Formed from hydrothermal veins or late-stage igneous crystallization; can occur in metamorphic environments. The green/darker material is likely a host rock or alteration mineral like chlorite.

Uses & applications

Used in glassmaking, electronics (if pure enough), construction aggregates, or as decorative yard stones.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Massive quartz pieces like this are often referred to as 'bull quartz'.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and conchoidal fracture. Found universally in many geological environments.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

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

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

metamorphic