mineral
Quartz (Drusy/Crystalline)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: Colorless to white/light purple; Luster: Vitreous/glassy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; SG: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Colorless to white/light purple
- Luster
- Vitreous/glassy
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Physical properties
Hardness: 7 (Mohs scale); Color: Colorless to white/light purple; Luster: Vitreous/glassy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; SG: 2.65
Formation & geological history
Formed from hydrothermal solutions or cooling silica-rich fluids in cavities or veins within igneous, metamorphic, or sedimentary host rocks.
Uses & applications
Used in glass manufacturing, electronics (piezoelectricity), timekeeping, jewelry (as druzy settings), and as a common collectible specimen.
Geological facts
Quartz is the second most abundant mineral in Earth's crust. 'Druse' refers to a surface covered with tiny, glinting crystals that grew into a void.
Field identification & locations
Identify by its hardness (scratches glass), glass-like luster, and lack of cleavage. Often found in geodes, vugs, or as vein filling in mountain ranges.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
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
![Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral](https://media.rockidentification.com/2391a63f-fb20-47d5-af9a-2035851eb32e-thumbnail.jpg)
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral