Harstigite Mineral Data
General Harstigite Information
Chemical Formula:
Ca6MnBe4(SiO4)2(Si2O7)2(OH)2
Composition:
Molecular Weight = 885.97 gm
Calcium 27.14 % Ca 37.98 % CaO
Manganese 6.20 % Mn 8.01 % MnO
Beryllium 4.07 % Be 11.29 % BeO
Silicon 19.02 % Si 40.69 % SiO2
Hydrogen 0.23 % H 2.03 % H2 O
Oxygen 43.34 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca6 Mn2+ Be4 (SiO4 )2 (Si2 O7 )2 (OH)2
Environment:
Occurs with garnet and rhodonite.
IMA Status:
Valid Species (Pre-IMA) 1886
Locality:
Harstig mine, Pajsberg, near Persber, Vermland, Switzerland. Link to MinDat.org Location Data.
Name Origin:
Named after its locality.
Name Pronunciation:
Harstigite + Pronunciation
Synonym:
ICSD 64790
PDF 20-200
Harstigite Crystallography
Axial Ratios:
a:b:c =1.0205:1:0.7107
Cell Dimensions:
a = 13.9, b = 13.62, c = 9.68, Z = 4; V = 1,832.60 Den(Calc)= 3.21
Crystal System:
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcmn
X Ray Diffraction:
By Intensity(I/Io ): 2.695(1), 2.788(0.5), 2.817(0.5),
Physical Properties of Harstigite
Cleavage:
None
Color:
Colorless, White.
Density:
3.16
Diaphaneity:
Translucent
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
5.5 - Knife Blade
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Harstigite
Gladstone-Dale:
CI meas = -0.005 (Superior) - where the CI = (1-KPDmeas /KC ) CI calc = 0.01 (Superior) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2119,KPDmeas = 0.2153,KC = 0.2142 Ncalc = 1.68 - 1.69
Optical Data:
Biaxial (+), a=1.678, b=1.68, g=1.683, bire=0.0050, 2V(Calc)=80, 2V(Meas)=52.
Calculated Properties of Harstigite
Electron Density:
Bulk Density (Electron Density)=3.13 gm/cc note: Specific Gravity of Harstigite =3.16 gm/cc.
Fermion Index:
Fermion Index = 0.05 Boson Index = 0.95
Photoelectric:
PEHarstigite = 5.67 barns/electronU=PEHarstigite x r Electron Density= 17.75 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Harstigite is Not Radioactive
Harstigite Classification
Dana Class:
57.01.01.02 (57) Sorosilicate Insular Si3O10 and Larger Noncyclic Groups
(57.01) with [Si3O10] groups
(57.01.01) Aminoffite and related species
57.01.01.01 Aminoffite Ca3Be2Si3O10(OH)2 I 4/mmm 4/m 2/m 2/m
57.01.01.02 Harstigite Ca6MnBe4(SiO4)2(Si2O7)2(OH)2 Pcmn 2/m 2/m 2/m
Strunz Class:
09.BF.05 09 - SILICATES (Germanates)
09.B - Sorosilicates
09.BF -Sorosilicates with mixed SiO4 and Si2O7 groups;
09.BF.05 Harstigite Ca6MnBe4(SiO4)2(Si2O7)2(OH)2 Pcmn 2/m 2/m 2/m
Other Harstigite Information
References:
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
See Also:
Links to other databases for Harstigite :
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
15 - WWW-MINCRYST
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Harstigite
Ca6MnBe4(SiO4)2(Si2O7)2(OH)2
Dana No: 57.01.01.02 Strunz No: 09.BF.05
Locality:
Notes:
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