ANORTHITE


Meaning of ANORTHITE in English

General Information:

Chemical Formula:

CaAl2Si2O8

Composition:

(Molecular Weight = 277.41 gm)

Sodium 0.41 % Na

Calcium 13.72 % Ca

Aluminum 18.97 % Al

Silicon 20.75 % Si

Oxygen 46.14 % O

Empirical Formula:

Na0.05Ca0.95Al1.95Si2.05O8

Environment:

Magmatic and metamorphic rocks.

Locality:

Monte Somma and Valle di Fassa, Italy.

Name Origin:

From the Greek, an + orthos, "not upright" in allusion to the oblique crystals.

Physical Properties:

Cleavage:

[001] Perfect, [010] Good

Color:

colorless, gray, white, red, or reddish gray.

Density:

2.72 - 2.75, Average = 2.73

Diaphaniety:

Transparent to Subtransparent to translucent

Habits:

Granular - Generally occurs as anhedral to subhedral crystals in matrix., Euhedral Crystals - Occurs as well-formed crystals showing good external form., Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

6 - Orthoclase

Luminescence:

None.

Luster:

Vitreous (Glassy)

Streak:

white

More details...

Mineralogy database English vocab.      Английский словарь базы данных минералогии .