Glaucochroite Mineral Data

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General Glaucochroite Information

Chemical Formula:

CaMnSiO4

Composition:

Molecular Weight = 187.10 gm

Calcium 21.42 % Ca 29.97 % CaO

Manganese 29.36 % Mn 37.91 % MnO

Silicon 15.01 % Si 32.11 % SiO₂

Oxygen 34.21 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMn²⁺SiO₄

Environment:

Metamorphosed limestone containing manganese minerals.

IMA Status:

Valid Species (Pre-IMA) 1899

Locality:

Franklin Furnace, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

From the Greek for blue green and color, in allusion to its color.

Name Pronunciation:

Glaucochroite + Pronunciation

Synonym:

ICSD 100650

PDF 14-376

Glaucochroite Image

Images:

Click Here for Larger Glaucochroite Image

Glaucochroite Zincite Willemite

Comments: Pinkish gray crystalline glaucochroite intermixed with pale green willemite, with dark red zincite and white calcite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Glaucochroite Crystallography

Axial Ratios:

a:b:c =0.4416:1:0.5834

Cell Dimensions:

a = 4.92, b = 11.14, c = 6.5, Z = 4; V = 356.26 Den(Calc)= 3.49

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

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

By Intensity(I/I_o): 1.85(1), 2.63(0.8), 2.69(0.8),

Crystal Structure:

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Lager G A , Meagher E P , American Mineralogist , 63 (1978) p.365-377, High-temperature structural study of six olivines, T = 25 deg C

View Additional jPOWD Structure files for Glaucochroite
[1] [2] [3]

Physical Properties of Glaucochroite

Cleavage:

{001} Indistinct

Color:

Green, White, Pinkish.

Density:

3.4

Diaphaneity:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

6 - Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Glaucochroite

Gladstone-Dale:

CI meas= -0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2039,KPDmeas= 0.2093,KC= 0.2044
Ncalc = 1.7 - 1.71

Optical Data:

Biaxial (-), a=1.679-1.686, b=1.716-1.723, g=1.729-1.736, bire=0.0500, 2V(Calc)=60, 2V(Meas)=61. Dispersion medium, r > v.

Calculated Properties of Glaucochroite

Electron Density:

Bulk Density (Electron Density)=3.39 gm/cc
note: Specific Gravity of Glaucochroite =3.49 gm/cc.

Fermion Index:

Fermion Index = 0.0074635133
Boson Index = 0.9925364867

Photoelectric:

PE_{Glaucochroite}= 10.73 barns/electron
U=PE_{Glaucochroite} x rElectron Density= 36.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Glaucochroite is Not Radioactive

Glaucochroite Classification

Dana Class:

51.03.02.03 (51)Nesosilicate Insular SiO4 Groups Only

(51.03)with all cations in octahedral [6] coordination

(51.03.02)Monticellite - Kirschsteinite series

51.03.02.01 Monticellite CaMgSiO4 P nma 2/m 2/m 2/m

51.03.02.02 Kirschsteinite CaFeSiO4 Pbmn 2/m 2/m 2/m

51.03.02.03 Glaucochroite CaMnSiO4 Pbnm 2/m 2/m 2/m

Strunz Class:

09.AC.05 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AC -Nesosilicates without additional anions;

09.AC.05 Forsterite Mg2SiO4 Pbnm 2/m 2/m 2/m

09.AC.05 Glaucochroite CaMnSiO4 Pbnm 2/m 2/m 2/m

09.AC.05 Fayalite Fe2SiO4 Pbnm 2/m 2/m 2/m

09.AC.05 Olivine* (Mg,Fe)2SiO4 Pbnm 2/m 2/m 2/m

09.AC.05 Kirschsteinite CaFeSiO4 Pbmn 2/m 2/m 2/m

09.AC.05 Laihunite FeFe2(SiO4)2 P 2₁/b 2/m

09.AC.05 Liebenbergite (Ni,Mg)2SiO4 Pbnm 2/m 2/m 2/m

09.AC.05 Tephroite Mn2SiO4 P nma 2/m 2/m 2/m

Other Glaucochroite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

See Also:

Links to other databases for Glaucochroite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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

Glaucochroite

CaMnSiO4
Dana No: 51.03.02.03 Strunz No: 09.AC.05
Locality:

Notes: