Ericaite Mineral Data

Ericaite Mineral Data +

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General Ericaite Information

Chemical Formula:

(Fe++,Mg,Mn)3B7O13Cl

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

Empirical Formula:

Fe²⁺_1.8Mg_0.9Mn²⁺_0.3B₇O₁₃Cl

Environment:

Forms a series with boracite.

IMA Status:

Valid Species (Pre-IMA) 1950

Locality:

Wathlingen-Hanigsen, Hannover, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the purple color of flowers from the genus Erica (Heather).

Synonym:

ICSD 9290 (Mg)

PDF 26-780

Ericaite Image

Images:

Ericaite

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

Axial Ratios:

a:b:c =0.9873:1:1.4004

Cell Dimensions:

a = 8.58, b = 8.69, c = 12.17, Z = 4; V = 907.40 Den(Calc)= 3.35

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P ca2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Cleavage:

None

Color:

Purple, Light green, Red, Black, Brown.

Density:

3.22

Diaphaniety:

Transparent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

7-7.5 - Quartz-Garnet

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ericaite

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

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

Electron Density:

r_electron=3.23 gm/cc
note: r_Ericaite=3.35 gm/cc.

Fermion Index

Fermion Index = 0.04252
Boson Index = 0.95748

Photoelectric:

PE_Ericaite= 8.32 barns/electron
U=PE_Ericaite x r_electron= 26.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ericaite is Not Radioactive

Ericaite Classification

Dana Class:

25.6.1.2 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.6)Dana Type

(25.6.1)Boracite Group (Orthorhombic: Rca21)

25.6.1.1 Boracite Mg3B7O13Cl P ca2₁ mm2

25.6.1.2 Ericaite (Fe,Mg,Mn)3B7O13Cl P ca2₁ mm2

25.6.1.3 Chambersite Mn3B7O13Cl P ca2₁ mm2

Strunz Class:

V/L.04-20 V - Nitrates, Carbonates and Borates

V/L - Shelly borates with [BO2]1- to [B6O10]2-

V/L.04 - Boracite - Congolite series

V/L.04-10 Boracite Mg3B7O13Cl P ca2₁ mm2

V/L.04-20 Ericaite (Fe,Mg,Mn)3B7O13Cl P ca2₁ mm2

V/L.04-30 Chambersite Mn3B7O13Cl P ca2₁ mm2

V/L.04-35 Trembathite (Mg,Fe)3B7O13Cl R 3c 3m

V/L.04-40 Congolite (Fe,Mg,Mn)3B7O13Cl R 3c 3m

Other Ericaite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Ericaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Ericaite Specimen Label here :

Ericaite

(Fe++,Mg,Mn)3B7O13Cl
Dana No: 25.6.1.2 Strunz No: V/L.04-20
Locality:

Notes: