Gahnite

Gahnite, ZnAl2O4, is a rare mineral belonging to the spinel group. It forms octahedral crystals which may be green, blue, yellow, brown or grey. It occurs in Falun, Sweden where it is found in pegmatites and skarns, contact metamorphic rocks. Other occurrences include Charlemont, Massachusetts; Spruce Pine, North Carolina; White Picacho district, Arizona; Topsham, Maine; and Franklin, New Jersey in the United States. It was named after the Swedish chemist, Johan Gottlieb Gahn (1745-1818) the discoverer of the element manganese. It is sometimes called zinc spinel.
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(n.)
Zinc spinel; automolite.
  

General Information:
 Chemical Formula:
ZnAl2O4
 Composition:
(Molecular Weight = 183.35 gm)
Aluminum 29.43 % Al
Zinc 35.66 % Zn
Oxygen 34.90 % O 
 Empirical Formula:
ZnAl2O4
 Environment:
Metamorphic and pegmatitic rocks.
 Locality:
Falun, Sweden.
 Name Origin:
Named after the Swedish chemist and mineralogist, J. G. Gahn (1745-1818).
Physical Properties:
 Cleavage:
[111] Indistinct
 Color:
bluish green, grayish green, deep leek green, greenish black, or bluish black.
 Density:
4 - 4.6, Average = 4.3
 Diaphaniety:
Subtransparent to opaque
 Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., Massive - Granular - Common texture observed in granite and other igneous rock., Striated - Parallel li nes on crystal surface or cleavage face.
 Hardness:
8 - Topaz
 Luminescence:
None.
 Luster:
Vitreous (Glassy)
 Streak:
gray
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gahnite
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Eng: gahnite
Urdu: گہنایٹ ۔ ایک سیاہ رَنگ کا معدن جو ایلومینم اور جَست کا مُرَکَّب ہے ۔