igneous

Pink Granite (Water-worn Cobble)

Granite (Alkali-feldspar granite)

Hardness: 6-7 (Mohs scale); Color: Pink/Red due to potassium feldspar, with grey quartz and dark biotite/hornblende; Luster: Dull (weathered) to vitreous (fresh); Structure: Phaneritic (coarse-grained); Specific Gravity: 2.63 - 2.75.

Hardness: 6-7 (Mohs scale)
Luster: Dull (weathered) to vitreous (fresh)

Identified April 11, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow crystallization of magma below Earth's surface. This specific specimen has been Rounded and smoothed by water transport (fluvial or glacial action).

Uses & applications

Used in construction as aggregate, countertops, monuments, and landscaping. Polished stones are used in home decor.

Geological facts

Granite makes up the majority of Earth's continental crust. The pink color specifically comes from an abundance of orthoclase feldspar.

Field identification & locations

Identify by the 'salt and pepper' look combined with pink hues and high hardness (cannot be scratched by a steel nail). Commonly found in glacial till, riverbeds, and mountainous regions like the Canadian Shield.

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