Feldspar, from Tanzania (No.74)

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Feldspar, from Tanzania (No.74)Feldspar, from Tanzania

Measurements Approx.
Height - 1.2 cm
Width - 1.7 cm
Length - 3.5 cm

The name feldspar derives from the German Feldspat, a compound of the words Feld, "field", and Spat, "a rock that does not contain ore". The change from Spat to -spar was influenced by the English word "spar", a synonym for "mineral". "Feldspathic" refers to materials that contain feldspar. The alternate spelling, felspar, has largely fallen out of use.


Feldspars are a group of rock-forming tectosilicate minerals that make up as much as 60% of the Earths crust.

Feldspars crystallise from magma as veins in both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock.