igneous

Granite (with Orthoclase and Quartz)

Phaneritic Felsic Igneous Rock (KAlSi3O8 + SiO2)

Hardness: 6-7 (Mohs scale), Color: Pink/Salmon (Orthoclase) and Gray/Translucent (Quartz), Luster: Vitreous to pearly, Structure: Crystalline/Phaneritic, Cleavage: Two directions at 90 degrees in feldspar crystals, Specific Gravity: 2.63 - 2.75

Identified March 25, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow cooling and crystallization of felsic magma deep beneath the Earth's surface (plutonic). Found in continental crust, often dating from the Precambrian to Cenozoic eras.

Uses & applications

Extensively used in construction (countertops, floor tiles, paving stones), as crushed stone for road base, and as dimensional stone for monuments and memorials.

Geological facts

Granite makes up the majority of the Earth's continental crust. Its pink color is specifically due to Potassium Feldspar (Orthoclase), while the gray smoky parts are Quartz crystals.

Field identification & locations

Identify by looking for visible interlocked crystals of different colors. It's commonly found in mountain ranges and shields. Collectors should look for signs of large inclusions or unique mineral coloration.

Other igneous specimens

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Blue Apatite

Fluorapatite (Ca5(PO4)3F)

mineral

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Igneous

Magnetite

Iron(II,III) oxide (Fe3O4)

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

mineral

Magnetite

Magnetite (Fe3O4)

mineral