Igneous / Metamorphic
Granite or Granitic Gneiss
Granitoid / Gneiss
AI-generated identification · may be incorrectHardness 6-7, mixed colors (white, gray, pink, black), crystalline texture, composed of quartz, feldspar, and mica.
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Physical properties
Hardness 6-7, mixed colors (white, gray, pink, black), crystalline texture, composed of quartz, feldspar, and mica.
Formation & geological history
Formed from slow cooling of magma deep underground (granite), or through high-grade regional metamorphism of igneous or sedimentary rocks (gneiss).
Uses & applications
Commonly used in construction, monuments, countertops, and landscaping.
Geological facts
Granite is one of the most common rocks in the continental crust. Gneiss often displays distinct banding (foliation).
Field identification & locations
Identify by its interlocking crystalline texture and mineral composition (light-colored quartz and feldspar with dark micas or amphiboles). Found worldwide in continental shields and mountain ranges.
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Other igneous / metamorphic specimens
Small quartz-rich mineral fragment
Quartz (SiO₂), possibly milky or chalcedonic quartz
mineral
Quartz vein fragment
Quartz, silicon dioxide (SiO₂), likely milky to translucent quartz with iron-oxide or clay inclusions
mineral
Quartz-rich rock, possibly milky quartz or quartzite
Quartz (SiO₂); if quartzite, recrystallized quartz sandstone
metamorphic
Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
mineral
Tumbled quartz pebble, possibly citrine or pale smoky quartz
Quartz (SiO₂), likely microcrystalline/tumbled material
mineral
Milky Quartz
Quartz (SiO2)
mineral