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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 ...
Martian spherules (also known as hematite spherules, blueberries, & Martian blueberries) are small spherules (roughly spherical pebbles) that are rich in an iron oxide (grey hematite, α-Fe 2 O 3) and are found at Meridiani Planum (a large plain on Mars) in exceedingly large numbers.
Hematine ring. Hematine (also magnetic hematite, hemalyke or hemalike) is an artificial magnetic material. [1] Hematine is widely used in jewelry. [citation needed]Although it is claimed by many that it is made from ground hematite or iron oxide mixed with a resin, analysis (of one object) has demonstrated it to be an entirely artificial compound, a barium-strontium ferrite.
A selection of glass beads Merovingian bead Trade beads, 18th century Trade beads, 18th century. A bead is a small, decorative object that is formed in a variety of shapes and sizes of a material such as stone, bone, shell, glass, plastic, wood, or pearl and with a small hole for threading or stringing. Beads range in size from under 1 ...
Glass beads of different colors and shapes from Ife Empire.. Glass in sub-Saharan Africa mostly consists of the importation of glass beads into sub-Saharan Africa, shipped primarily from the Middle East and India as early as 200-300 AD; later, from Portugal, the Netherlands, and Venice.
Hematite group Corundum Al 2 O 3; Hematite Fe 2 O 3; Ilmenite FeTiO 3; XO 2 form Rutile group Rutile TiO 2; Pyrolusite MnO 2; Cassiterite SnO 2; Baddeleyite ZrO 2; Uraninite UO 2; Thorianite ThO 2; XY 2 O 4 form Spinel group Spinel MgAl 2 O 4; Gahnite ZnAl 2 O 4; Magnetite Fe 3 O 4 (Fe 2+ Fe 3+ 2 O 4) Franklinite (Zn,Fe,Mn)(Fe,Mn) 2 O 4 ...
Maghemite (Fe 2 O 3, γ-Fe 2 O 3) is a member of the family of iron oxides.It has the same formula as hematite, but the same spinel ferrite structure as magnetite (Fe 3 O 4) and is also ferrimagnetic.
Bixbyite is a manganese iron oxide mineral with chemical formula: (Mn,Fe) 2 O 3.The iron/manganese ratio is quite variable and many specimens have almost no iron. It is a metallic dark black with a Mohs hardness of 6.0 – 6.5. [3]