-
composed of
iron(II)
carbonate (FeCO3). Its name
comes from the
Ancient Gr**** word σίδηρος (sídēros),
meaning "
iron". A
valuable iron ore, it consists...
- is a
common iron oxide compound with the formula, Fe2O3 and is
widely found in
rocks and soils.
Hematite crystals belong to the
rhombohedral lattice system...
- titanium-
iron oxide mineral with the
idealized formula FeTiO 3. It is a
weakly magnetic black or steel-gray solid.
Ilmenite is the most
important ore of titanium...
-
rhombohedral,
corundum (α-Al2O3)
structure and is the most
common form. It
occurs naturally as the
mineral hematite,
which is
mined as the main
ore of...
-
rhodochrosite is trigonal, with a
structure and
cleavage in the
carbonate rhombohedral system. The
carbonate ions (CO2− 3) are
arranged in a
triangular planar...
- graphite.
Rhombohedral graphite cannot occur in pure form.
Natural graphite, or
commercial natural graphite,
contains 5 to 15%
rhombohedral graphite and...
- 85 Å. This symmetry, however, is due to
twinning of fine
domains with
rhombohedral symmetry,
trigonal -3m,
point group R-3m, a = 3.92 Å, c = 48 Å, Z = 15...
- can be
found in most
geological environments. It is not, however, an
ore of
iron, but can be
instead oxidized to
produce sulfuric acid.
Related to the...
- smithsonite.
Crystals have the form of
hexagonal prisms terminated by
rhombohedral planes:
there are
distinct cleavages parallel to the prism-faces and...
- and
ferric iron (Fe-III) with a
chemical formula of KFe3(SO4)2(OH)6. This
sulfate mineral is
formed in
ore deposits by the
oxidation of
iron sulfides....
