Table of Contents
What is Chloritoid mineral?
Chloritoid is a silicate mineral of metamorphic origin. It is an iron magnesium manganese alumino-silicate hydroxide with formula (Fe, Mg, Mn) 2Al. 4Si.
Where is Gahnite found?
Locality: Falun, Sweden. Name Origin: Named after the Swedish chemist and mineralogist, J. G. Gahn (1745-1818).
What colour is cordierite?
| Cordierite | |
|---|---|
| Color | Blue, smoky blue, bluish violet; greenish, yellowish brown, gray; colorless to very pale blue in thin section in transmitted light |
| Crystal habit | Pseudo-hexagonal prismatic twins, as imbedded grains, and massive |
| Twinning | Common on {110}, {130}, simple, lamellar, cyclical |
What is cordierite made of?
Cordierite, discovered more than two centuries ago, is a naturally occurring mineral compound containing magnesium, iron, aluminum, and silicon. It’s found, among other places, near veins of tin in the mines of Southern England.
What is chloritoid used for?
Chloritoid is a characteristic mineral of low and medium grade regionally metamorphosed pelitic rocks, slates, phyllites and schists. It is commonly used as a zone mineral between chlorite and staurolite in orogenic belts.
How do you identify staurolite?
Staurolite is usually easy to identify when it occurs as visible grains in a metamorphic rock. Grains of staurolite are typically larger than the grains of other minerals in the rock, and they often exhibit an obvious crystal structure. They occur as six-sided crystals, often with penetration twins.
What does bornite look like?
Bornite has a brown to copper-red color on fresh surfaces that tarnishes to various iridescent shades of blue to purple in places. Its striking iridescence gives it the nickname peacock copper or peacock ore.
How is Pentlandite formed?
Pentlandite is the most common terrestrial nickel sulfide; it typically forms during cooling of magmatic sulfide melts during the evolution of parent silicate melt. Pentlandite typically concentrates within the lower margin of a mineralized layered intrusive.
What kind of rock is andalusite?
metamorphic mineral
Andalusite is a common metamorphic mineral which forms under low pressure and low to high temperatures. The minerals kyanite and sillimanite are polymorphs of andalusite, each occurring under different temperature-pressure regimes and are therefore rarely found together in the same rock.