Igneous / Metamorphic
Granite or Granitic Gneiss
Granitoid / Gneiss
Hardness 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
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Milky Quartz
Quartz (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral