Mineral 1.0: O

Mineral 1.0

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SilicateOlivine

Mg₂SiO₄ - Fe₂SiO₄
Other names/forms:
Forsterite (Mg) and Fayalite (Fe)

Most distinguishing features:
Pistachio-green colour and granular habit.
Industrial/economical uses:
Peridote (a translucent variety of olivine) is considered a 'gem' mineral. Also used as a refractory sand and infrequently as an abrasive.

SilicateOrthoclase

KAlSi₃O₈
Other names/forms:
Kspar

Most distinguishing features:
Colour and evidence of exsolution with plagioclase.