mineral

Druzy Quartz (on Geode Fragment)

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale; Color: Colorless to milky white (with potential iron staining on substrate); Luster: Vitreous (glassy) to brilliant sparkling; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on the Mohs scale
Luster: Vitreous (glassy) to brilliant sparkling

Identified March 15, 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 the precipitation of silica-rich hydrothermal fluids in cavities or vesicles within igneous or sedimentary rocks. This specific piece appears to be a fragment of a geode lining, which can range from millions to hundreds of millions of years old depending on the host formation.

Uses & applications

Commonly used in jewelry (as 'druzy' pendants), home decor, and metaphysical collecting. Industrially, quartz is used in glassmaking, abrasive blasting, and electronics due to its piezoelectric properties.

Geological facts

The word 'quartz' comes from the German word 'Quarz', which had a Slavic origin meaning 'hard'. 'Druzy' refers to the tiny glittering crystals that cover a host rock, creating a sugar-like appearance. It is one of the most abundant minerals in the Earth's continental crust.

Field identification & locations

Identify in the field by its high hardness (it will scratch glass), sparkling 'sugary' texture, and resistance to chemical weathering. It is commonly found in Brazil, Morocco, and the Midwestern United States. For collectors, look for the 'sparkle' effect under light and the lack of cleavage planes.

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