General Diopside Information
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Chemical Formula: |
CaMgSi2O6 |
Composition: |
Molecular Weight = 216.55 gm |
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Calcium 18.51 % Ca 25.90 % CaO |
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Magnesium 11.22 % Mg 18.61 % MgO |
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Silicon 25.94 % Si 55.49 % SiO2 |
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Oxygen 44.33 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
CaMg(Si2O6) |
Environment: |
Basic and ultrabasic igneous and metamorphic rocks. |
IMA Status: |
Valid Species (Pre-IMA) 1800 |
Locality: |
Wide spread occurrence. Link to MinDat.org Location Data. |
Name Origin: |
From the Greek dis - "two kinds" and opsis - "opinion." |
Synonym: |
Dillage |
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ICSD 100738 |
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PDF 19-239 |
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Diopside Image |
Images:
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Images:
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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 |
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Diopside Crystallography
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Axial Ratios: |
a:b:c =1.0935:1:0.589 |
Cell Dimensions: |
a = 9.761, b = 8.926, c = 5.258, Z = 4; beta = 105.8° V = 440.80 Den(Calc)= 3.26 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c |
X Ray Diffraction: |
By Intensity(I/Io): 2.991(1), 2.528(0.4), 2.893(0.3), |
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Crystal Structure:
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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
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Physical Properties of Diopside
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Cleavage: |
[110] Good, [???] Indistinct |
Color: |
Blue, Brown, Colorless, Green, Gray. |
Density: |
3.25 - 3.55, Average = 3.4 |
Diaphaniety: |
Transparent to translucent |
Fracture: |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
Habit: |
Blocky - Crystal shape tends to be equant (e.g. feldspars). |
Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Hardness: |
6 - Orthoclase |
Luminescence: |
None. |
Luster: |
Vitreous (Glassy) |
Streak: |
white green |
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Optical Properties of Diopside
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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 |
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. |
Pleochroism (x): |
pale bluish green or dark blue green. |
Pleochroism (y): |
brownish green or dark blue green. |
Pleochroism (z): |
yellowish green or yellow bluish green. |
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Calculated Properties of Diopside
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Electron Density: |
relectron=3.39 gm/cc note: rDiopside =3.40 gm/cc. |
Fermion Index |
Fermion Index = 0.02379 Boson Index = 0.97621 |
Photoelectric: |
PEDiopside = 3.51 barns/electron U=PEDiopside x relectron= 11.91 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Diopside is Not Radioactive |
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Diopside Classification
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Dana Class: |
65.1.3a.1 (65)Inosilicate Single-Width Unbranched Chains, W=1 |
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(65.1)with chains P=2 |
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(65.1.3a)C2/c clinopyroxenes (Ca clinopyroxenes) |
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65.1.3a.1 Diopside CaMgSi2O6 C 2/c 2/m |
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65.1.3a.2 Hedenbergite CaFeSi2O6 C 2/c 2/m |
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65.1.3a.3 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m |
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65.1.3a.4 Johannsenite CaMnSi2O6 C 2/c 2/m |
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65.1.3a.5 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m |
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65.1.3a.6 Esseneite CaFeAlSiO6 C 2/c 2/m |
Strunz Class: |
VIII/F.01-50 VIII - Silicates |
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VIII/F - Inosilicates (chain and band) double chains [Si2O6]4- |
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VIII/F.01 - Pyroxene group, Clinopyroxene |
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VIII/F.01-10 Clinoenstatite Mg2Si2O6 P 21/c 2/m |
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VIII/F.01-20 Clinoferrosilite (Fe,Mg)2Si2O6 P 21/c 2/m |
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VIII/F.01-30 Kanoite (Mn,Mg)2Si2O6 P 21/c 2/m |
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VIII/F.01-40 Pigeonite (Mg,Fe,Ca)(Mg,Fe)Si2O6 P 21/c 2/m |
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VIII/F.01-50 Diopside CaMgSi2O6 C 2/c 2/m |
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VIII/F.01-60 Hedenbergite CaFeSi2O6 C 2/c 2/m |
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VIII/F.01-70 Johannsenite CaMnSi2O6 C 2/c 2/m |
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VIII/F.01-80 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m |
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VIII/F.01-90 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m |
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VIII/F.01-100 Omphacite (Ca,Na)(Mg,Fe,Al)Si2O6 P 2/n 2/m |
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VIII/F.01-110 Esseneite CaFeAlSiO6 C 2/c 2/m |
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VIII/F.01-120 Spodumene LiAlSi2O6 C 2/c 2/m |
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VIII/F.01-130 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m |
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VIII/F.01-140 Aegirine NaFeSi2O6 C 2/c 2/m |
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VIII/F.01-145 Namansilite NaMn(Si2O6) C 2/c 2/m |
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VIII/F.01-150 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m |
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VIII/F.01-160 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m |
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VIII/F.01-170 Kosmochlor NaCrSi2O6 C 2/c 2/m |
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Other Diopside Information
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References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) |
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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Print or Cut-and-Paste your Diopside Specimen Label here :
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Diopside
CaMgSi2O6
Dana No: 65.1.3a.1 Strunz No: VIII/F.01-50
Locality:
Notes:
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