metamorphic
Milky quartz-bearing rock, possibly quartzite or quartz vein
Quartz (SiO₂), likely with feldspar and minor iron-oxide inclusions
AI-generated identification · may be incorrectWhite to translucent, vitreous-to-waxy luster, massive granular texture, and no obvious cleavage; quartz hardness is Mohs 7, with specific gravity about 2.65. The rough gray-brown areas may be feldspar, mica, or weathered host rock, so exact identification is uncertain from the photograph.
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Physical properties
White to translucent, vitreous-to-waxy luster, massive granular texture, and no obvious cleavage; quartz hardness is Mohs 7, with specific gravity about 2.65. The rough gray-brown areas may be feldspar, mica, or weathered host rock, so exact identification is uncertain from the photograph.
Formation & geological history
Likely formed as a silica-rich vein or from metamorphism and recrystallization of sandstone; such material can form from Precambrian through younger geological ages. Iron staining and surface weathering account for the brown and gray patches.
Uses & applications
Common quartz-rich rock is used for aggregate, silica, glass, ceramics, and occasionally decorative stone; attractive translucent pieces may be cut or polished, though this specimen appears mainly a field collectible.
Geological facts
Milky quartz contains microscopic fluid inclusions, fractures, or mineral impurities that scatter light and produce its cloudy appearance. It commonly occurs in hydrothermal veins and quartz-rich metamorphic rocks.
Field identification & locations
Common worldwide, especially in quartz veins, mountain belts, and granitic terrains. A glassy fracture, lack of cleavage, resistance to scratching by a steel blade, and inability to scratch glass support quartz; acid testing is unnecessary.
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