igneous

Granite

Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)

Hardness: 6-7 (Mohs scale); Color: Salt and pepper/light gray/pinkish; Luster: Dull to vitreous; Crystal Structure: Phaneritic (coarse-grained crystals visible to the naked eye); Cleavage: Indistinct on rock level, dependent on mineral constituents; Specific Gravity: 2.63 - 2.75

Hardness: 6-7 (Mohs scale)
Color: Salt and pepper/light gray/pinkish
Luster: Dull to vitreous

Identified April 10, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below Earth’s surface (intrusive). This specimen shows a phaneritic texture common in batholiths and mountain ranges. It can date back to any geological era based on location.

Uses & applications

Extensively used in construction for countertops, floor tiles, and paving. Also used for monuments, sculptures, and as aggregate for roads and railways.

Geological facts

Granite is the most common igneous rock found at the Earth's surface and makes up a significant portion of the continental crust. The Yosemite Valley in California is one of the most famous examples of massive granite formations.

Field identification & locations

Identify in the field by its speckled 'salt and pepper' appearance and visible interlocking crystals of quartz and feldspar. It is found in the cores of mountain ranges and weathered outcrops across all continents.

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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)

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Blue Apatite

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

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Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

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Magnetite

Magnetite (Fe3O4)

mineral