mineral
Milky quartz with possible feldspar
Quartz (SiO₂), possibly intergrown with feldspar
AI-generated identification · may be incorrectWhite to translucent, vitreous-to-dull surfaces, irregular fracture; quartz hardness 7 Mohs and hexagonal crystal structure. The photo does not establish the identity of the gray and tan material or show diagnostic cleavage clearly.
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Physical properties
White to translucent, vitreous-to-dull surfaces, irregular fracture; quartz hardness 7 Mohs and hexagonal crystal structure. The photo does not establish the identity of the gray and tan material or show diagnostic cleavage clearly.
Formation & geological history
Likely a fragment of a quartz-rich vein or pegmatite formed as silica-rich fluids cooled in fractures; age and exact setting cannot be determined from the image.
Uses & applications
Quartz is used in glassmaking, electronics, and decorative stone; attractive pieces may be kept as inexpensive specimens.
Geological facts
Milky appearance results from light scattering by tiny fluid or gas inclusions and internal fractures.
Field identification & locations
Look for glassy luster and hardness sufficient to scratch ordinary glass; quartz lacks the repeated flat cleavage planes typical of feldspar. Quartz is widespread worldwide in veins and igneous and metamorphic rocks.
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Granite (Phaneritic intrusive igneous rock)
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