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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
Fracture Pattern - Crack propagation path the angle θ has a strong influence on tensile crack initiation and propagation.
Shape - variety of shapes and sizes
Luster - Shiny
Texture - medium to coarse-grained, phaneritic
Where It Can Be Found - In volcanic arcs, and in cordilleran mountain building, such as in the Andes Mountains.
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"
Hardness On The Mohs Scale - 4 To 7 Out Of 10
