Mineralogy Database

Ericaite Mineral Data

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General Ericaite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mg,Mn)3B7O13Cl
Help on Composition: Composition: Molecular Weight = 458.00 gm
   Magnesium   4.78 %  Mg    7.92 % MgO
   Manganese   3.60 %  Mn    4.65 % MnO
   Iron       21.95 %  Fe   28.24 % FeO
   Boron      16.52 %  B    53.20 % B2O3
   Chlorine    7.74 %  Cl    7.74 % Cl
                -   %   Cl   -1.75 % -O=Cl2   
   Oxygen     45.41 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+1.8Mg0.9Mn2+0.3B7O13Cl
Help on Environment: Environment: Forms a series with boracite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1950
Help on Locality: Locality: Wathlingen-Hanigsen, Hannover, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the purple color of flowers from the genus Erica (Heather).
Help on Name Pronunciation: Name Pronunciation: Ericaite Say ERICAITE
Help on Synonym: Synonym: ICSD 9290 (Mg)
  PDF 26-780

Ericaite Image

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Comments: Cubic crystal ericaite.
Location: Bischofferode, Nordhausen, Erfurt district, Harz Mts, Thuringia, Germany. Scale: Crystal size 3.7 mm.
© Thomas Witzke / Abraxas-Verlag

Ericaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9873:1:1.4004
Help on Cell Dimensions: Cell Dimensions: a = 8.58, b = 8.69, c = 12.17, Z = 4; V = 907.40 Den(Calc)= 3.35
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: P ca21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.04(1), 2.06(0.7), 2.72(0.6),2.15(0.5), 1.83(0.4), 3.51(0.4), 1.24(0.3), 1.47(0.2),

Physical Properties of Ericaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Purple, Light green, Red, Black, Brown.
Help on Density: Density: 3.22
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Pseudo Cubic - Crystals show a cubic outline.
Help on Hardness: Hardness: 7-7.5 - Quartz-Garnet
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Ericaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.069 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.223,KPDmeas= 0.232,KC= 0.2169
Ncalc = 1.7 - 1.73
Help on Optical Data: Optical Data: Biaxial (-), a=1.731, b=1.755, g=1.755, bire=0.0240, 2V(Calc)=0, 2V(Meas)=small.

Calculated Properties of Ericaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.23 gm/cc
note: Specific Gravity of Ericaite =3.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEEricaite = 8.32 barns/electron
U=PEEricaite x rElectron Density= 26.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ericaite is Not Radioactive

Ericaite Classification

Help on  Dana Class: Dana Class: (25)Anhydrous Borates Containing Hydroxyl or Halogen
  (25.06)Dana Type
  (25.06.01)Boracite Group (Orthorhombic: Rca21) Boracite Mg3B7O13Cl P ca21 mm2 Ericaite (Fe,Mg,Mn)3B7O13Cl P ca21 mm2 Chambersite Mn3B7O13Cl P ca21 mm2
Help on  Strunz Class: Strunz Class: 06.GA.05 06 - BORATES
  06.G - Heptaborates and other Megaborates
  06.GA -Tekto-heptaborates
06.GA.05 Boracite Mg3B7O13Cl P ca21 mm2
06.GA.05 Chambersite Mn3B7O13Cl P ca21 mm2
06.GA.05 Ericaite (Fe,Mg,Mn)3B7O13Cl P ca21 mm2

Other Ericaite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Ericaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 06.GA.05





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