Mineral Information and Data:

Ashoverite
Zn(OH)2 [CNMNC approved formula]

Named for the locality: Milltown, near Ashover, Derbyshire, England.

IMA status : Approved Species 1988 (IMA1986-008)
CLASSIFICATION 
Dana
(8th edition) :
06.02.11.01  
  (06) Hydroxides and Oxides Containing Hydroxyl
  (06.02) where X++ (OH)2
  (06.02.11)
  
Nickel-Strunz
(10th edition) :
04.FA.10
  (04) Oxides and Hydroxides
  (04.F) Hydroxides (without V or U)
  (04.FA) Hydroxides with OH, without H2O; corner-sharing tetrahedra
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
Unit cell: a = 6.825Å, c = 33.36Å
Crystal Habit: Crystals are square plates, to about 0.5 mm, which thin markedly toward their edges; commonly in stellate groups of crystals intersecting at angles of 60°–70°.
  
Color: Colorless to milky in the center of crystals
Diaphaneity: Translucent
Luster: Dull to vitreous
Measured Density: 3.3 g/cm3
Cleavage: Perfect on {001}
Streak: White
  
Polymorphism and Series: Trimorphous with sweetite and wulfingite.
Geologic Setting: In an oxidized vein in limestone (near Ashover, England).
Mineral Association: Sweetite, wulfingite, fluorite (near Ashover, England)
  
Luminescent Properties: Fluoresces bluish white under SW UV.

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