Mineral Information and Data:

Bafertisite
BaFe2+2Ti(Si2O7)O(OH)2 [CNMNC approved formula]

Named for elements in the composition, BArium, iron (FERrum), TItanium, and SIlicon.

IMA status : Valid species (Pre-IMA 1959) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
56.02.06b.01  
  (56) Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02) with cations in [4] and/or >[4] coordination
  (56.02.06b) Seidozerite - Lamprophyllite group (Bafertisite subgroup)
  
Nickel-Strunz
(10th edition) :
09.BE.55
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BE) Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
  
Crystal system: Monoclinic System
Point group (H-M): m — domatic
Unit cell: a = 10.6Å, b = 13.64Å, c = 12.47Å; β = 119.5°
Crystal Habit: Crystals of simple rhombic habit, elongated along [100] and flattened on {001}. As aggregates of acicular crystals, to 1.5 cm.
Twinning: Ubiquitous on {001}, polysynthetic
  
Color: Bright red, yellowish red to light brown, straw-brown to tan
Diaphaneity: Semi-transparent.
Hardness (Mohs): 5
Measured Density: 3.96 - 4.25 g/cm3
Cleavage: Perfect on {001}
  
Polymorphism and Series: Forms a series with hejtmanite.
Geologic Setting: In hydrothermal veins (Baiyun-Obo deposit, China); in a dike of microcline granite-aplite (Burpala massif, Russia).
Mineral Association: Aegirine, fluorite, barite, bastnasite (Baiyun-Obo deposit, China).
  

 

Bafertisite
Light brown mm-sized crystals in matrix
Origin: Fountain Quarry, Pitt Co., North Carolina, U.S.A.
Sample size: 2 x 4 cm
Photo: Diederik Visser

<<< BACK TO MINERAL SEARCH