mineral
Milky quartz with iron-oxide staining
Quartz (SiO₂), likely with goethite/limonite coatings
AI-generated identification · may be incorrectWhite to translucent, glassy-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65. The brown-gold surface is probably iron-oxide/hydroxide staining, with possible minor host-rock inclusions.
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Physical properties
White to translucent, glassy-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65. The brown-gold surface is probably iron-oxide/hydroxide staining, with possible minor host-rock inclusions.
Formation & geological history
Quartz formed when silica-rich fluids crystallized in a vein or cavity, commonly in igneous or metamorphic rocks; the specimen’s exact geological age cannot be determined from the photograph. Later weathering produced the rusty coating.
Uses & applications
Common quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive pieces are sold as inexpensive display or lapidary specimens.
Geological facts
Quartz is one of Earth’s most abundant minerals and is chemically resistant, often surviving after surrounding rock weathers away.
Field identification & locations
Identify it by its white translucency, hardness (it should scratch ordinary glass), lack of cleavage, and irregular conchoidal fracture. Common worldwide, especially in quartz veins and granite- or metamorphic-rock terrains.
