Mineral 1.0: Oxides

Mineral 1.0

Test your knowledge of specific minerals

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OxideChromite

FeCr₂O₄

Most distinguishing features:
Resembles magnetite and ilmenite, but not very magnetic and has a more resinous lustre.
Industrial/economical uses:
Only ore mineral for chromium.

OxideCorundum

Al₂O₃

Most distinguishing features:
Hardness is best indicator, crystal habit is good too.
Industrial/economical uses:
Used as a gemstone. High-quality ruby can be more valuable than diamond. Corundum is also used as an abrasive in sandpaper, polishing compounds, etc.

OxideHematite (massive)

Fe₂O₃
Other names/forms:
Haematite

Most distinguishing features:
Deep red streak and earthy lustre are indicative. SG may also be indicative.
Industrial/economical uses:
Important ore or iron, sometimes used as a gemstone.

OxideHematite (specular)

Fe₂O₃
Other names/forms:
Haematite

Most distinguishing features:
Shining gray metallic lustre and deep-red streak are indicative.
Industrial/economical uses:
Important ore of iron.

OxideMagnetite

Fe₃O₄

Most distinguishing features:
Highly magnetic. Habit and colour are also indicators.
Industrial/economical uses:
Mined for iron. Crushed magnetite also been used as aggregate to make high-density concrete for specialized applications, such as nuclear reactors.

OxidePyrolusite

MnO₂

Most distinguishing features:
Will leave sooty marks if touched.
Industrial/economical uses:
Manganese is used to colour bricks.