Igneous

Pink Granite

Phaneritic Acidic Plutonic Rock (primarily K-feldspar, quartz, and plagioclase)

Hardness: 6-7 on Mohs scale. Color: Mottled pink to reddish-orange with grey and white specks. Luster: Dull to vitreous. Crystal structure: Phaneritic (coarse-grained) crystalline. Cleavage: Indistinct. Specific gravity: 2.63 to 2.75.

Hardness: 6-7 on Mohs scale
Color: Mottled pink to reddish-orange with grey and white specks
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 in continental crust. This specific appearance is often found in Precambrian or Paleozoic formations where orthoclase feldspar is abundant and oxidized.

Uses & applications

Extensively used in construction as aggregate, countertops, floor tiles, and dimensional stone for monuments and memorials due to its durability and aesthetic appeal.

Geological facts

The pink coloration is caused by high concentrations of potassium feldspar (orthoclase). Granite makes up a large portion of the Earth's continental crust and is unique to Earth compared to other planets in our solar system.

Field identification & locations

Identify in the field by its 'salt and pepper' texture with visible interlocking grains of pink feldspar and glassy quartz. Common in batholiths and mountain ranges like the Sierra Nevada or the Scottish Highlands. Collectors should look for large, well-defined crystals.

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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.

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Magnetite

Iron(II,III) oxide (Fe3O4)

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Sodalite - Na8(Al6Si6O24)Cl2

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Blue Apatite

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

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Magnetite

Magnetite (Fe3O4)

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