There are two kinds of homogeneous and multi-variant variants of Fe2O3 in nature, namely α-Fe2O3 and γ-Fe2O3.
The former is stable under natural conditions, known as hematite; the latter in natural conditions as α-Fe2O3 stable, in a metastable state, known as the magnetic hematite.
Addition of Ti, Al, Mn, Fe2 +, Ca, Mg and a small amount of Ga and Co., which are mixed with the same kind of Ti and Al, Fe, 69.94% and O 30.06%
Triangular crystal system, intact crystal rare.
Crystalline hematite is steel gray, aphanitic; soil hematite was red.
Striped cherry red or fresh liver color.
Metal to semi-metallic luster.
Hardness 5 ~ 6.
The proportion of 5 ~ 5.3.
hematite collection has a variety of forms, the formation of some mineral subspecies, namely:
(1) mirror iron ore for the metallic luster of the rose or flaky hematite collection.
(2) Mica hematite with metallic luster of fine squares hematite.
(3) oolitic or renal hematite morphology was oolitic or renal hematite.
Abstract: Hematite is one of the most widely distributed iron minerals in nature. It can be formed in various geological functions, but it is mainly composed of hydrothermal action, sedimentation and regional metamorphism. 11219988112128
In the oxidation zone, hematite can be limonite or iron ore, goethite formed by dehydration.
But can also become acorn ore and water hematite and so on.
In the reduction conditions, hematite can be converted into magnetite, called illusion magnetite.