|HEMATITE MINERAL FACTS|
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Hematite Mineral Facts:
Chemical Formula: Fe2O3
Colors: Steel grey or iron black. Streak and earthy forms are red.
5.5 to 6.5
Cleavage: None. Fracture subconchoidal or uneven.
Luster:. Metallic luster when well crystalized. Other forms may be earthy and dull.
Optics: (Refractive Index): Opaque
The crystals are often tabular, and sometimes are grouped into aggregates resembling rosettes. In many cases the terminal faces are rounded. A parting is often observed parallel to the basal plane, due to the occurrence of the mineral in aggregates in which each crystal is tabular.
Usually earthy or in botryoidal to reniform shapes with radiating structure. At times micaceous; crystallized. The crystalline and earthy aggregates of hematite to which distinct names have been given are:
Specular: when the aggregate consists of grains with a glistening,metallic luster, like the luster of the crystals. When the grains are thin tabular the aggregate is said to be micaceous.Kidney Ore: Columnar or fibrous form, also in fibrous masses. The color is usually brownish red and the luster dull. The botryoidal, stalactic and various imitative forms belong here. Red hematite is a compact red variety in which the fibrous structure is not very pronounced. Red Ocher is a red earthy hematite mixed with more or less clay and other impurities. Clay ironstone is a hard brownish or reddish variety with a dull luster. It is usually a mixture of hematite with sand or clay. Oolitic Ore is a red variety composed of compacted spherical or nearly spherical grains that have a concentric structure.Fossil ore differs from oolitic ere mainly in the fact that there are present in it small shells and fragments of shells that are now composed entirely of hematite.
Identification and Diagnostics
Localities and Origins:
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Please note that the author, Chris Ralph, retains all copyrights to this entire document and it may not be reproduced, quoted or copied without permission.
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