mineral

Quartz Geode Segment

Crystalline Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent grayish-white with dark inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Luster: Vitreous to waxy

Identified June 2, 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 via precipitation of silica-rich hydrothermal fluids within a pre-existing cavity (vug) in sedimentary or volcanic rock. Over time, quartz crystals grow inward from the cavity walls.

Uses & applications

Commonly used as decorative display pieces, educational specimens in geology, and believed by some to have metaphysical healing properties. Pure quartz is used in electronics and glassmaking.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. These specific porous geode fragments are often referred to as 'popcorn quartz' due to their bubbly, botryoidal, or aggregate texture.

Field identification & locations

Identify by its hardness (it will scratch glass), its white-to-gray color, and the presence of small internal crystal cavities. Found worldwide, especially in desert regions or areas with ancient volcanic activity.

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