Mineral Information and Data:

Apachite
Cu2+9Si10O29 • 11H2O [CNMNC approved formula]

Named for the Apache Indians, whose reservation is near the locality.

IMA status : Approved Species 1979 (IMA1979-022)
CLASSIFICATION 
Dana
(8th edition) :
78.04.01.01  
  (78) Unclassified silicates
  (78.04) possible inosilicates
  (78.04.01)
  
Nickel-Strunz
(10th edition) :
09.HE.10
  (09) Silicates
  (09.H) Unclassified Silicates
  (09.HE) With Cu, Zn
  
Crystal system: Monoclinic System
Point group (H-M): Unknown — Unk
Unit cell: a = 12.89 Å, b = 6.055 Å, c = 19.11 Å, b = 90.42°
Crystal Habit: As minute, twisted or curved beaded spherules of radial ¯bers, composed of crystals; in seams, exhibiting a silky, fibrous structure on broken surfaces.
  
Color: Blue
Diaphaneity: Transparent to translucent
Luster: Non-metallic, silky
Hardness (Mohs): 2
Measured Density: 2.80 g/cm3
Streak: Light blue
  
Geologic Setting: A retrograde metamorphic or mesogene mineral, formed at the expense of a prograde calc-silicate and sulfide assemblage in tactites; typically in fractures or crackled zones cutting garnet-diopside rock, replacing both these silicates and calcite.
Mineral Association: Kinoite, gilalite, stringhamite, junitoite, clinohedrite, xonotlite, apophyllite, calcite, tobermorite
  

 

Apachite
Spherical crystals as singles to 0.2 mm and bunches in vuggy matrix.
Origin: Christmas mine, Gila Co., Arizona, U.S.A. (type locality)
Sample size: 5 x 3 x 2.5 cm
Photo: Tom Loomis

 

Apachite
(zoom-in of above)

<<< BACK TO MINERAL SEARCH