Diopside Mineral Data + Say DIOPSIDE

General Diopside Information

Help on Chemical  Formula: Chemical Formula: CaMgSi2O6
Help on Composition: Composition: Molecular Weight = 216.55 gm
   Calcium    18.51 %  Ca   25.90 % CaO
   Magnesium  11.22 %  Mg   18.61 % MgO
   Silicon    25.94 %  Si   55.49 % SiO2
   Oxygen     44.33 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaMg(Si2O6)
Help on Environment: Environment: Basic and ultrabasic igneous and metamorphic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1800
Help on Locality: Locality: Wide spread occurrence. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek dis - "two kinds" and opsis - "opinion."
Help on Synonym: Synonym: Dillage
  ICSD 100738
  PDF 19-239
 

Diopside Image

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Diopside   Grossular

Comments: Pale blue prismatic crystal of diopside with orange-brown grossular.
Location: Val d'Aosta, Italy. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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Diopside   Magnesioferrite

Comments: Very dark brown Magnesioferrite Pleonaste (Iron-Magnesium spinel) with cream colored Calcite and gray green diopside.
Location: Aldan, Gon River, Russia. Scale: 6 x 4.5 cm.
© Fabre Minerals

Diopside Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0935:1:0.589
Help on Cell Dimensions: Cell Dimensions: a = 9.761, b = 8.926, c = 5.258, Z = 4; beta = 105.8° V = 440.80 Den(Calc)= 3.26
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.991(1), 2.528(0.4), 2.893(0.3),
Help on Forms: Forms:

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Forms: [ 0 1 0] [ 1 1 1] [ 2 2 1] [ 1 0 1] [ 1 0 0] [ 0 0 1]

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Cameron M , Sueno S , Prewitt C T , Papike J J , American Mineralogist , 58 (1973) p.594-618, High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite,, spodumene, and ureyite, T = 24 C, pyroxene

View Additional jPOWD Structure files for Diopside
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [3] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [4] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [5] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [6] [60] [61] [62] [63] [64] [65] [66] [67] [68] [69] [7] [70] [8] [9]
 

Physical Properties of Diopside

Help on Cleavage: Cleavage: [110] Good, [???] Indistinct
Help on Color: Color: Blue, Brown, Colorless, Green, Gray.
Help on Density: Density: 3.25 - 3.55, Average = 3.4
Help on Diaphaniety: Diaphaniety: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Blocky - Crystal shape tends to be equant (e.g. feldspars).
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white green
 

Optical Properties of Diopside

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2126,KPDmeas= 0.2039,KC= 0.207
Help on Optical Data: Optical Data: Biaxial (+), a=1.663-1.699, b=1.671-1.705, g=1.693-1.728, bire=0.0290-0.0300, 2V(Calc)=56-64, 2V(Meas)=58-63. Dispersion weak to distinct, r > v.
Help on Pleochroism (x): Pleochroism (x): pale bluish green or dark blue green.
Help on Pleochroism (y): Pleochroism (y): brownish green or dark blue green.
Help on Pleochroism (z): Pleochroism (z): yellowish green or yellow bluish green.
 

Calculated Properties of Diopside

Help on Electron Density: Electron Density:

relectron=3.39 gm/cc
note: rDiopside =3.40 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.02379
Boson Index = 0.97621
Help on Photoelectric: Photoelectric:

PEDiopside = 3.51 barns/electron
U=PEDiopside x relectron= 11.91 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Diopside is Not Radioactive

 

Diopside Classification

Help on  Dana Class: Dana Class: 65.1.3a.1 (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.1)with chains P=2
  (65.1.3a)C2/c clinopyroxenes (Ca clinopyroxenes)
 
65.1.3a.1 Diopside CaMgSi2O6 C 2/c 2/m
 
65.1.3a.2 Hedenbergite CaFeSi2O6 C 2/c 2/m
 
65.1.3a.3 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m
 
65.1.3a.4 Johannsenite CaMnSi2O6 C 2/c 2/m
 
65.1.3a.5 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m
 
65.1.3a.6 Esseneite CaFeAlSiO6 C 2/c 2/m
Help on  Strunz Class: Strunz Class: VIII/F.01-50 VIII - Silicates
  VIII/F - Inosilicates (chain and band) double chains [Si2O6]4-
  VIII/F.01 - Pyroxene group, Clinopyroxene
 
VIII/F.01-10 Clinoenstatite Mg2Si2O6 P 21/c 2/m
 
VIII/F.01-20 Clinoferrosilite (Fe,Mg)2Si2O6 P 21/c 2/m
 
VIII/F.01-30 Kanoite (Mn,Mg)2Si2O6 P 21/c 2/m
 
VIII/F.01-40 Pigeonite (Mg,Fe,Ca)(Mg,Fe)Si2O6 P 21/c 2/m
 
VIII/F.01-50 Diopside CaMgSi2O6 C 2/c 2/m
 
VIII/F.01-60 Hedenbergite CaFeSi2O6 C 2/c 2/m
 
VIII/F.01-70 Johannsenite CaMnSi2O6 C 2/c 2/m
 
VIII/F.01-80 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m
 
VIII/F.01-90 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m
 
VIII/F.01-100 Omphacite (Ca,Na)(Mg,Fe,Al)Si2O6 P 2/n 2/m
 
VIII/F.01-110 Esseneite CaFeAlSiO6 C 2/c 2/m
 
VIII/F.01-120 Spodumene LiAlSi2O6 C 2/c 2/m
 
VIII/F.01-130 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m
 
VIII/F.01-140 Aegirine NaFeSi2O6 C 2/c 2/m
 
VIII/F.01-145 Namansilite NaMn(Si2O6) C 2/c 2/m
 
VIII/F.01-150 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m
 
VIII/F.01-160 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m
 
VIII/F.01-170 Kosmochlor NaCrSi2O6 C 2/c 2/m
 

Other Diopside Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Diopside :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Applied Mineralogy 6 -Athena 7 - CalTech Mineral Spectroscopy 8 - Crocoite.com Mineral Locations 9 - EUROmin Project 10 - Franklin Minerals(Dunn) 11 - Franklin Minerals(Palache) 12 -Google Images 13 -Google Scholar 14 -Handbook of Mineralogy (MinSocAm) 15 -Handbook of Mineralogy (UofA) 16 - HyperPhysics 17 -MinDAT 18 -MinMax(Deutsch) 19 -MinMax(English) 20 - Mineral and Gemstone Kingdom 21 -Mineralienatlas (Deutsch) 22 - Minerals of Wisconsin 23 -QUT Mineral Atlas 24 - Scandinavian mineral gallery 25 - Tradeshop.com - The Rainbow of Gems 26 - UCLA - Petrography Thin-Sections 27 - University of Manchester - Mineral Structure 28 -University of Minnesota 29 - WWW-MINCRYST 30 -theimage 31 -École des Mines de Paris

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Diopside

CaMgSi2O6
Dana No: 65.1.3a.1 Strunz No: VIII/F.01-50
Locality:

 

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