Mineral Information and Data:

Feruvite
CaFe2+3(Al5Mg)(BO3)3Si6O18(OH)3F [CNMNC approved formula]

Named from iron (Latin ferrum) and uvite.

IMA status : Approved Species 1989 (IMA1987-057)
CLASSIFICATION 
Dana
(8th edition) :
61.03b.01.04  (This Dana# Changed)
  (61) Cyclosilicate Six-Membered Rings
  (61.03b) with borate groups (Calcic Tourmaline Subgroup)
  (61.03b.01) Liddicoatite Subgroup
  
Nickel-Strunz
(10th edition) :
09.CK.05
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CK) [Si6O18]12- branched 6-membered single rings, with insular complex anions
  
Crystal system: Trigonal System
Point group (H-M): 3m — ditrigonal-pyramidal
Unit cell: a = 16.01 Å, c = 7.24 Å
Crystal Habit: Subhedral to anhedral grains to 2 mm
  
Color: Dark brown to black
Diaphaneity: Semi-transparent
Luster: Vitreous to dull
Hardness (Mohs): 7
Measured Density: 3.207 g/cm3
Cleavage: None Observed
Tenacity: Brittle
Fracture: Conchoidal
Streak: Gray
  
Geologic Setting: By hydrothermal replacement of silicates in a pegmatitic rock.
Mineral Association: Dravite, quartz, microcline, chlorapatite, pyrite
  
Comments: Fe2+ analogue of uvite

 

Feruvite
Polycrystalline oriented-aggregate of diaspore
with black feruvite in emery ore (3.5 cm long)
Origin: Kiura mine (Shin-Kiura mine; Kiura emery mine), Saeki city, Oita prefecture, Kyushu Region, Japan
Photo: Copyright © R. Tanaka

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