Hornblende



Hornblende

Amphibole Hornblende
General
Categoryigneous
Chemical formulaCa2(Mg, Fe, Al)5 (Al, Si)8O22(OH)2
Identification
Colorblack/dark green
Crystal habithexagonal/granular
Crystal systemmonoclinic
Cleavageimperfect at 56 and 124 degrees
Fractureuneven
Mohs Scale hardness5-6
Lustervitreous to dull
Streakbrown-grey
Specific gravity2.9

Hornblende is a complex charnockite.

Hornblende is a common constituent of many tschermakite.

The word hornblende is derived from the German horn and blenden, to 'blind' or 'dazzle'. The term blende is often used to refer to a brilliant non-metallic uraninite.

See also

References

  • Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., John Wiley and Sons, New York, p 416-7, ISBN 0-471-80580-7
  • Mineral galleries retrieved 06/21/05
  • Mindat retrieved 06/21/05
  • Scandinavian mineral gallery retrieved 06/21/05
  • Table Info retrieved 2/27/07
 
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