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Diorite

Diorite is a coarse-grained igneous rock that forms when magma cools slowly underground. It's made up of plagioclase feldspar, amphibole, and pyroxene minerals, with small amounts of biotite mica.

Colors It Comes In - Light Gray To Dark Gray, Or Even Black

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Fracture - Crack propagation path the angle θ has a strong influence on tensile crack initiation and propagation.

 

Shape - Variety of shapes and sizes

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Luster - Shiny & Dull

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Texture - Medium To Coarse-Grained, Phaneritic

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Streak - White to Grayish-White

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Locality -

Europe: Leicestershire and Aberdeenshire in the UK, Thuringia and Saxony in Germany, Sondrio in Italy, central Sweden, and Finland 
North and South America: The Andes Mountains, southern Vancouver Island in Canada, the Basin and Range province and Minnesota in the US, and Concordia in South Africa 
New Zealand: The Darran Range 
Australia: A pink feldspar crystal-rich diorite cabochon called "Pink Marshmallow Stone" 

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Where It Can Be Found - In volcanic arcs, and in cordilleran mountain building, such as in the Andes Mountains.

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Hardness On The Mohs Scale - 4 To 7 Out Of 10

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