Mineral Information and Data:

Aminoffite
Ca3(BeOH)2Si3O10 [CNMNC approved formula]

Named for Gregori Aminoff (1993-1947), Swedish mineralogist and expert on Långban mineralogy, associated with the Riksmuseum Stockholm, Sweden.

IMA status : Valid species (Pre-IMA 1937) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
57.01.01.01  
  (57) Sorosilicate Insular Si3O10 and Larger Noncyclic Groups
  (57.01) with [Si3O10] groups
  (57.01.01) Aminoffite and related species
  
Nickel-Strunz
(10th edition) :
09.BH.05
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BH) Sorosilicates with Si3O10, Si4O11, etc. anions; cations in tetrahedral [4] and greater coordination
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
Unit cell: a = 9.806 Å, c = 9.919 Å
Crystal Habit: As small, euhedral, pyramidal crystals, to 1 mm.
Twinning: common, polysynthetic on {001}
  
Color: Colorless, pale yellow
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 5.5 - 6
Measured Density: 2.94 g/cm3
Cleavage: 1; {001} imperfect
Tenacity: Brittle
Fracture: Conchoidal
Streak: White
  
Geologic Setting: In cavities in massive magnetite (Långban, Sweden); in fluorite veins at the contact between marbles and "hornblende" granites associated with hastingsite nepheline syenites (Dugdinsk massif, Russia); in fluorite veins in tinguaite and nephelinite dikes (Bayankolsk dike field, Russia).
Mineral Association: Magnetite, goethite (Långban, Sweden); fluorite (Russia)
  

 

Aminoffite
Origin: Långban, Varmland, Sweden
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Aminoffite
Origin: Långban, Varmland, Sweden
Sample size: Microscopic image
Photo and Owner: Lou Perloff

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