Mineralogy Database

Merwinite Mineral Data

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General Merwinite Information

Help on Chemical  Formula: Chemical Formula: Ca3Mg(SiO4)2
Help on Composition: Composition: Molecular Weight = 328.71 gm
   Calcium    36.58 %  Ca   51.18 % CaO
   Magnesium   7.39 %  Mg   12.26 % MgO
   Silicon    17.09 %  Si   36.56 % SiO2
   Oxygen     38.94 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3Mg(SiO4)2
Help on Environment: Environment: In siliceous dolomitic limestone in contact metamorphic zones, formed at relatively elevated temperatures.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1921
Help on Locality: Locality: Crestmore quarry, 5 miles NW of Riverside, Riverside Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Herbert Eugene Merwin (1878-1963), American mineralogist and petrologist, Carnegie Institute, Washington, D.C., USA.
Help on Name Pronunciation: Name Pronunciation: Merwinite + Pronunciation Say MERWINITE
Help on Synonym: Synonym: ICSD 26002
  PDF 35-591

Merwinite Image

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Comments: Dark brown crystalline merwinite in light green crystalline massive marble.
Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Merwinite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.504:1:1.7623
Help on Cell Dimensions: Cell Dimensions: a = 13.254, b = 5.293, c = 9.328, Z = 4; beta = 91.9° V = 654.03 Den(Calc)= 3.34
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.6865(1), 2.6712(0.65), 2.653(0.47),

Physical Properties of Merwinite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Colorless, Gray, Pale green.
Help on Density: Density: 3.15
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Merwinite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.088 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2135,KPDmeas= 0.2264,KC= 0.208
Ncalc = 1.66 - 1.69
Help on Optical Data: Optical Data: Biaxial (+), a=1.706-1.708, b=1.711-1.712, g=1.718-1.724, bire=0.0120-0.0160, 2V(Calc)=62-82, 2V(Meas)=67. Dispersion r > v.

Calculated Properties of Merwinite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.33 gm/cc
note: Specific Gravity of Merwinite =3.34 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMerwinite = 5.30 barns/electron
U=PEMerwinite x rElectron Density= 17.66 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Merwinite is Not Radioactive

Merwinite Classification

Help on  Dana Class: Dana Class: (51)Nesosilicate Insular SiO4 Groups Only
  (51.04)with cations in [6] and >[6] coordination
  (51.04.02)Dana Group Merwinite Ca3Mg(SiO4)2 P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.AD.15 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AD -Nesosilicates without additional anions;
09.AD.15 Merwinite Ca3Mg(SiO4)2 P 21/a 2/m

Other Merwinite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Merwinite :
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: 09.AD.15





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