SUBJECTS  Staurolite
   
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Staurolite

Staurolite is a red brown to black, mostly opaque, nesosilicate mineral Mineral

Minerals are natural compounds formed through geological [i] processes. ... 

 with a white streak. It crystallizes in the monoclinic Monoclinic crystal system

In crystallography [i], the monoclinic crystal system [i] is one of the 7 lattice point group [i]s. ... 

 crystal system, has a Mohs hardness of 7 to 7.5 and a rather complex chemical formula: 2Al94O22OH2. Iron Iron

Iron is a chemical element [i] with the symbol Fe and atomic number [i] 26. ... 

, magnesium Magnesium

Magnesium is the chemical element [i] in the periodic table [i] that has the symbol Mg and atomic number [i] ... 

 and zinc Zinc

Zinc is a chemical element [i] in the periodic table [i] that has the symbol Zn and atomic number [i] ... 

 occur in variable ratios. A special property of staurolite is that it often occurs twinned Crystal twinning

Crystal twinning occurs when two separate crystals share some of the same crystal lattice [i] points in ... 

 in a characteristic cross-shape. The macroscopically visible crystal Crystal

In chemistry [i] and mineralogy [i], a crystal is a solid [i] in which the constituent atom [i]s, molecule [i] ... 

s are of prismatic shape. They are often larger than the surrounding minerals and are then called porphyroblast Porphyroblast

A porphyroblast is a large mineral [i] crystal [i] in a metamorphic rock [i] which has grown within the ... 

s.

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Encyclopedia


Staurolite is a red brown to black, mostly opaque, nesosilicate mineral Mineral

Minerals are natural compounds formed through geological [i] processes. ... 

 with a white streak. It crystallizes in the monoclinic Monoclinic crystal system

In crystallography [i], the monoclinic crystal system [i] is one of the 7 lattice point group [i]s. ... 

 crystal system, has a Mohs hardness of 7 to 7.5 and a rather complex chemical formula: 2Al94O22OH2. Iron Iron

Iron is a chemical element [i] with the symbol Fe and atomic number [i] 26. ... 

, magnesium Magnesium

Magnesium is the chemical element [i] in the periodic table [i] that has the symbol Mg and atomic number [i] ... 

 and zinc Zinc

Zinc is a chemical element [i] in the periodic table [i] that has the symbol Zn and atomic number [i] ... 

 occur in variable ratios.

A special property of staurolite is that it often occurs twinned Crystal twinning

Crystal twinning occurs when two separate crystals share some of the same crystal lattice [i] points in ... 

 in a characteristic cross-shape. The macroscopically visible crystal Crystal

In chemistry [i] and mineralogy [i], a crystal is a solid [i] in which the constituent atom [i]s, molecule [i] ... 

s are of prismatic shape. They are often larger than the surrounding minerals and are then called porphyroblast Porphyroblast

A porphyroblast is a large mineral [i] crystal [i] in a metamorphic rock [i] which has grown within the ... 

s.

The name is derived from the Greek, stauros for cross and lithos for stone in reference to the common twinning.
Staurolite is a regional metamorphic mineral of intermediate to high grade. It occurs with almandine garnet Garnet

The garnet group of mineral [i]s show crystal [i]s with a habit of rhombic dodecahedron [i]s and trapezohedron [i] ... 

, mica Mica

The mica group of sheet silicate [i] minerals [i] includes several closely related materials hav ... 

s, kyanite Kyanite

Kyanite, whose name derives from the Greek word kyanos, meaning blue, is a typically blue silicate [i]... 

 and other metamorphic minerals.

It is the official state mineral of Georgia Georgia

Georgia may mean:
  • Georgia [i], a sovereign state in the Caucasus region of Eurasia: **Formerly ... 

    .

References