igneous

Granite (Weathered)

Course-grained Intrusive Igneous Rock

Hardness: 6-7 (Mohs scale), Color: tan, brown/yellow oxide weathering, dark speckling from biotite/hornblende, Luster: dull to vitreous, Crystal Structure: Phaneritic (visible interlocking crystals), Specific Gravity: 2.6-2.7

Identified March 1, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow cooling of silica-rich magma deep underground. This specimen shows a weathered 'rind' due to exposure to water and air, oxidizing the iron-bearing minerals and creating the brownish-yellow crust.

Uses & applications

Construction aggregate, dimension stone for countertops and monuments, and architectural veneers. Highly valued for durability and aesthetics.

Geological facts

Granite makes up a large portion of the Earth's continental crust. Its name comes from the Latin 'granum', meaning a grain, in reference to its coarse-grained structure.

Field identification & locations

Identify by visible interlocking grains of quartz (clear/grey) and feldspar (white/pink). Look for dark mica flakes. Found globally in mountainous regions and shield areas.

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