-
Hercynite is a
spinel mineral with the
formula FeAl2O4. It
occurs in high-grade
metamorphosed iron-rich
argillaceous (clay-containing)
sediments as well...
- in
which the
mineral is
intimately mixed with magnetite, hematite, or
hercynite. In
addition to its hardness,
corundum has a
density of 4.02 g/cm3 (251 lb/cu ft)...
- (aluminium oxide),
mixed with
other minerals such as the iron-bearing spinels,
hercynite, and magnetite, and also
rutile (titania).
Industrial emery may contain...
- (MgCr2O4). A
substitution of the
element aluminium can also occur,
leading to
hercynite (FeAl2O4).
Chromite today is
mined particularly to make
stainless steel...
- is
carried out at high
temperatures greater than 1400 °C,
though the "
Hercynite cycle" is
capable of
temperatures as low as 1200 °C. The
oxidative water...
-
Hemihedrite Hemimorphite Hemusite Hendricksite Heptasartorite Herbertsmithite Hercynite Herderite Hermannjahnite Hessite Heulandite (series of zeolites) Hexaferrum...
- MgAl2O4,
after which this
class of
minerals is
named Gahnite: ZnAl2O4
Hercynite: FeAl2O4 Galaxite: MnAl2O4 Pleonaste: (Mg,Fe)Al2O4 Iron spinels: Cuprospinel:...
-
epidote and zoisite, calcite, sphene, andalusite, sillimanite, kyanite,
hercynite (a
green spinel), rutile,
orthite and tourmaline.
Though occasionally...
- Hja
Hughesite Hug
Hydroxycancrinite Hccn
Hagendorfite Hag Haüyne Hyn
Hercynite Hc Hloušekite Hšk ****zingite-(Al) ****-Al Hydroxyferroroméite Hfr Haggertyite...
- dark, fine to medium-grained
matrix of magnetite, ilmenite, olivine, and
hercynite spinel.
Magnetite and
ilmenite ****ulates are also
common in
layered intrusions...
