mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White to creamy yellowish-white, Luster: Vitreous to greasy, Crystal structure: Trigonal (often massive in tumbled form), Cleavage: None/Conchoidal fracture, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to creamy yellowish-white, Luster: Vitreous to greasy, Crystal structure: Trigonal (often massive in tumbled form), Cleavage: None/Conchoidal fracture, Specific gravity: 2.65
Formation & geological history
Formed in hydrothermal veins and pegmatites when silica-rich fluids cool. Its white color is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in glassmaking, abrasives, electronics (piezoelectric properties), and widely as tumbled stones for decor and metaphysical collections.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz found in nature.
Field identification & locations
Identified by its waxy luster, hardness (will scratch glass), and lack of cleavage. Often found in riverbeds or as veins in larger rock outcrops. Common worldwide.
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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
![Biotite Schist (Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]) — metamorphic](https://media.rock.id/9ca564b5-bc87-402b-965a-69b21f9aa6bf-thumbnail.jpg)
Biotite Schist
Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]
metamorphic