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2. Hematite - Wikipedia

   en.wikipedia.org/wiki/Hematite

   Hematite (/ ˈ h iː m ə ˌ t aɪ t, ˈ h ɛ m ə-/), also spelled as haematite, is a common iron oxide compound with the formula, Fe 2 O 3 and is widely found in rocks and soils. [6] Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of Fe 2 O 3. It has the same crystal structure as corundum ...

3. Shattuckite - Wikipedia

   en.wikipedia.org/wiki/Shattuckite

   Shattuckite is a copper silicate hydroxide mineral with formula Cu 5 (SiO 3) 4 (OH) 2.It crystallizes in the orthorhombic – dipyramidal crystal system and usually occurs in a granular massive form and also as fibrous acicular crystals.

4. Asterism (gemology) - Wikipedia

   en.wikipedia.org/wiki/Asterism_(gemology)

   Asterism is generated by reflections of light from twin-lamellae or from extremely fine needle-shaped acicular inclusions within the stone's crystal structure. [1] A common cause is oriented sub-microscopic crystals of rutile within the gem mineral. It occurs in rubies, sapphires, garnet, diopside, and spinel when a cabochon is cut from a ...

5. Iron(III) oxide - Wikipedia

   en.wikipedia.org/wiki/Iron(III)_oxide

   Iron(III) oxide in a vial. Iron(III) oxide or ferric oxide is the inorganic compound with the formula Fe 2 O 3.It occurs in nature as the mineral hematite, which serves as the primary source of iron for the steel industry.

6. Heliotrope (mineral) - Wikipedia

   en.wikipedia.org/wiki/Heliotrope_(mineral)

   The "classic" bloodstone is translucent to opaque green chalcedony and red jasper that contains inclusions of hematite. The red jasper may resemble spots of blood , hence the name bloodstone . Other colors of chalcedony may also occur in Indian bloodstone, such as white, yellow, or blue.

7. Iron (II,III) oxide - Wikipedia

   en.wikipedia.org/wiki/Iron(II,III)_oxide

   Iron(II,III) oxide, or black iron oxide, is the chemical compound with formula Fe 3 O 4.It occurs in nature as the mineral magnetite.It is one of a number of iron oxides, the others being iron(II) oxide (FeO), which is rare, and iron(III) oxide (Fe 2 O 3) which also occurs naturally as the mineral hematite.

8. Jaspillite - Wikipedia

   en.wikipedia.org/wiki/Jaspillite

   Jaspillite is typically a banded mixture of hematite and quartz common in the banded iron formation rocks of Proterozoic and Archaean age in the Canadian Shield. Jaspillite is also formed as exhalative chemical sediments in certain lead-zinc ore deposits, and as a hydrothermal alteration facies around submarine volcanism. It is used as a ...

9. Spinel group - Wikipedia

   en.wikipedia.org/wiki/Spinel_group

   The spinels are any of a class of minerals of general formulation AB 2 X 4 which crystallise in the cubic (isometric) crystal system, with the X anions (typically chalcogens, like oxygen and sulfur) arranged in a cubic close-packed lattice and the cations A and B occupying some or all of the octahedral and tetrahedral sites in the lattice.