Mineral Information and Data:

Aluminomagnesiohulsite
Mg2(Al,Mg,Sn)O2(BO3) [CNMNC approved formula]

Named in 2002 as the Al and Mg dominant member of the hulsite group.

IMA status : Renamed IMA Approved; 2002 (IMA2002-038)
CLASSIFICATION 
Dana
(8th edition) :
24.02.03.03  (This Dana# Added)
  (24) Borates - Anhydrous
  (24.02) where (A)2 BO2 [XO3]
  (24.02.03)
  
Nickel-Strunz
(10th edition) :
06.AB.45
  (06) Borates
  (06.A) Monoborates
  (06.AB) BO3, without additional anions; 1(D) + OH, etc.
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 5.334Å, b = 3.03Å, c = 10.5Å β = 94.46°
Crystal Habit: Crystals prismatic; subhedral
  
Color: Brown
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 6
Measured Density: 3.84 g/cm3
Streak: Dark brown
  
Geologic Setting: Occurs in Paleozoic kotoite marble in the contact zone of a Mesozoic granosyenite massif.
  
Synonyms/varieties: IMA2002-038
Comments: Alumino-magnesiohulsite - Renamed Aluminomagnesiohulsite by Mineralogical Record, v39 (2008), p131

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