igneous

Pink Granite (Gneissic Granite)

Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Hardness: 6-7 (Mohs); Color: Pink to salmon orange with gray/black specks; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible grains); Specific gravity: 2.63-2.75

Hardness: 6-7 (Mohs)
Color: Pink to salmon orange with gray/black specks
Luster: Dull to vitreous

Identified April 11, 2026More igneous →

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Physical properties

Hardness: 6-7 (Mohs); Color: Pink to salmon orange with gray/black specks; Luster: Dull to vitreous; Crystal structure: Phaneritic (visible grains); Specific gravity: 2.63-2.75

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface. This specimen shows slight foliation (alignment of minerals), suggesting it may be a gneissic granite formed under high pressure. Geological age can range from Precambrian to Cenozoic depending on location.

Uses & applications

Used widely in construction as dimension stone, countertops, floor tiles, and as crushed aggregate for roads. Polished specimens are used for monuments and grave markers.

Geological facts

Pink granite gets its distinctive color from an abundance of potassium feldspar (orthoclase). It is one of the oldest and most durable rocks found on the Earth's crust.

Field identification & locations

Identify in the field by its 'salt and pepper' appearance mixed with pink hues and its inability to be scratched by a steel blade. Commonly found in continental crystalline basements and mountain ranges.

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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)

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Sodalite

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Blue Apatite

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

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Magnetite

Magnetite (Fe3O4)

mineral