igneous
Quartz-rich pegmatitic rock, possibly quartzite or milky quartz with iron staining
Predominantly quartz (SiO₂), with probable feldspar and iron-oxide staining; exact classification is uncertain from the photograph
AI-generated identification · may be incorrectWhite to gray, translucent massive quartz with vitreous to greasy luster and irregular fracture; quartz hardness is Mohs 7, with no obvious cleavage. Red-brown areas are likely hematite or limonite coatings/inclusions.
Identified More igneous →
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Physical properties
White to gray, translucent massive quartz with vitreous to greasy luster and irregular fracture; quartz hardness is Mohs 7, with no obvious cleavage. Red-brown areas are likely hematite or limonite coatings/inclusions.
Formation & geological history
Likely formed in a silica-rich igneous vein or pegmatite, or by metamorphic recrystallization of sandstone into quartzite; age cannot be determined visually. Iron-bearing fluids later stained fractures and cavities.
Uses & applications
Common quartz-rich rock is used as aggregate, silica feedstock, landscaping stone, and decorative material; attractive pieces may be cut or polished, but this specimen appears mainly collectible.
Geological facts
Milky quartz becomes opaque from microscopic fluid inclusions and fractures. Red coloration commonly reflects oxidized iron rather than red quartz itself.
Field identification & locations
Look for abundant interlocking quartz, hardness sufficient to scratch glass, and lack of cleavage; feldspar, if present, shows blocky cleavage and lower hardness. Common in hydrothermal veins, pegmatites, and metamorphic terrains.
