mineral
Milky quartz
Quartz (SiO₂)
AI-generated identification · may be incorrectLikely massive, translucent-to-opaque quartz with a pale cream/tan color and vitreous luster. Hardness 7 Mohs; trigonal crystal structure, no cleavage, and conchoidal fracture; specific gravity about 2.65.
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Physical properties
Likely massive, translucent-to-opaque quartz with a pale cream/tan color and vitreous luster. Hardness 7 Mohs; trigonal crystal structure, no cleavage, and conchoidal fracture; specific gravity about 2.65.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and fractures, or during cooling of silica-rich magma. Quartz occurs in rocks of many geological ages; the specimen’s age cannot be determined from the image.
Uses & applications
Commonly used as a decorative and lapidary material; quartz is also important in glassmaking, abrasives, and electronics.
Geological facts
Quartz is one of Earth’s most abundant minerals and is resistant to weathering, so it commonly accumulates in sediments.
Field identification & locations
The hardness, glassy sheen, and lack of cleavage help distinguish quartz from softer calcite. The image shows a rough, massive specimen, but exact identification would require testing; common sources include Brazil, Madagascar, and the United States.
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Epidote
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Granite (Phaneritic intrusive igneous rock)
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