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 % H₂O

Oxygen 43.34 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₆Mn²⁺Be₄(SiO₄)₂(Si₂O₇)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

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

By Intensity(I/I_o): 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:

PE_Harstigite= 5.67 barns/electron
U=PE_Harstigite x rElectron 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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Print or Cut-and-Paste your Harstigite Specimen Label here :

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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