igneous

Granite (Weathered)

Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)

Hardness: 6-7 on Mohs scale; Color: Mottled salt-and-pepper (pink, white, grey, and black); Luster: Dull to vitreous; Structure: Phaneritic (coarse-grained) crystalline; Specific gravity: 2.63 to 2.75.

Hardness: 6-7 on Mohs scale
Color: Mottled salt-and-pepper (pink, white, grey, and black)
Luster: Dull to vitreous

Identified March 25, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface. This specimen shows a rounded shape and yellowish-brown oxidation, indicating it was likely weathered in a riverbed or soil for a significant period. Ages can range from Precambrian to Cenozoic.

Uses & applications

Used extensively as a construction material (dimension stone), countertops, flooring, and as crushed stone for road base. Weathered specimens are often used in landscaping for a 'natural' rustic look.

Geological facts

Granite makes up a large portion of the Earth's continental crust. Because it is so hard and durable, it was the preferred stone for ancient Egyptian monuments and obelisks.

Field identification & locations

Identify in the field by its visible interlocking crystals of varied colors and its high resistance to scratching. This specific specimen's 'rusty' staining is due to the oxidation of iron-bearing minerals like biotite or hornblende. Commonly found in mountainous regions or glacial till.

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Blue Apatite

Fluorapatite (Ca5(PO4)3F)

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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

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Blue Apatite

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

mineral

Magnetite

Magnetite (Fe3O4)

mineral