Pyrope Mineral Data + Say PYROPE


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General Pyrope Information
Help on Chemical Formula: Chemical Formula: Mg3Al2(SiO4)3
Help on Composition: Composition: Molecular Weight = 403.13 gm
   Magnesium  18.09 %  Mg   29.99 % MgO
   Aluminum   13.39 %  Al   25.29 % Al2O3
   Silicon    20.90 %  Si   44.71 % SiO2
   Oxygen     47.63 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg3Al2(SiO4)3
Help on Environment: Environment: Ultra basic igneous rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1803
Help on Locality: Locality: Zoblitz, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, pyropos, "fiery-eyed" in allusion to the red hue.
Help on Synonym: Synonym: ICSD 71887
  PDF 15-742
  Rhodolite
 

Pyrope Image

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Pyrope

Comments: Transparent, dark-red pyrope garnet.
Location: Governador Valadares, Rio Doce, Minas Gerais, Southeast Region, Brazil. Scale: 6x6x6 mm.
© John Betts - Fine Minerals

Pyrope Crystallography
Help on Cell Dimensions: Cell Dimensions: a = 11.459, Z = 8; V = 1,504.67 Den(Calc)= 3.56
Help on Crystal System: Crystal System: Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.54(1), 2.58(1), 2.88(0.6),
Help on Forms: Forms:

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Forms: [ 2 1 1]

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Click Here for Large Pyrope Structure Window Crystal Structure:

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Gibbs G V , Smith J V , American Mineralogist , 50 (1965) p.2023-2039, Refinement of the crystal structure of synthetic pyrope, refinement D, note that temperature factors reported for Si were labelled, incorrectly in the paper

View Additional jPOWD Structure files for Pyrope
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [3] [4] [5] [6] [7] [8] [9]
 

Physical Properties of Pyrope

Help on Cleavage: Cleavage: None
Help on Color: Color: Blood red, Orange red, Purple red, Pink, Black red.
Help on Density: Density: 3.65 - 3.84, Average = 3.74
Help on Diaphaniety: Diaphaniety: Transparent to subtranslucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Hardness: Hardness: 7.5 - Garnet
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Pyrope

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2093,KPDmeas= 0.1989,KC= 0.2053
Help on Optical Data: Optical Data: Isotropic, n=1.73-1.76.
 

Calculated Properties of Pyrope

Help on Electron Density: Electron Density:

relectron=3.53 gm/cc
note: rPyrope =3.56 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.02807
Boson Index = 0.97193
Help on Photoelectric: Photoelectric:

PEPyrope = 1.59 barns/electron
U=PEPyrope x relectron= 5.63 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pyrope is Not Radioactive
 

Pyrope Classification
Help on Dana Class: Dana Class: 51.4.3a.1 (51)Nesosilicate Insular SiO4 Groups Only
  (51.4)with cations in [6] and >[6] coordination
  (51.4.3a)Garnet group (Pyralspite series)
 
51.4.3a.1 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m
 
51.4.3a.2 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m
 
51.4.3a.3 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m
 
51.4.3a.4 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m
 
51.4.3a.5 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m
 
51.4.3a.6 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m
Help on Strunz Class: Strunz Class: VIII/A.08-10 VIII - Silicates
  VIII/A - Nesosilicates with [SiO4]4-groups, cations of octahedral and cubic orientation [8+6]
  VIII/A.08 - Garnet group, Pyrope - Henritermierite
 
VIII/A.08-10 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m
 
VIII/A.08-20 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m
 
VIII/A.08-30 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m
 
VIII/A.08-40 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m
 
VIII/A.08-50 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m
 
VIII/A.08-60 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m
 
VIII/A.08-70 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m
 
VIII/A.08-80 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m
 
VIII/A.08-90 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m
 
VIII/A.08-100 Hydrougrandite? (Ca,Mg,Fe)3(Fe,Al)2(SiO4)3-x(OH)4x I a3d 4/m 3 2/m
 
VIII/A.08-110 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m
 
VIII/A.08-120 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m
 
VIII/A.08-125 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m
 
VIII/A.08-130 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m
 
VIII/A.08-138 Yamatoite! (Mn,Ca)3(V,Al)2(SiO4)3 I a3d 4/m 3 2/m
 
VIII/A.08-140 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m
 
VIII/A.08-150 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m
 
VIII/A.08-160 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 41/acd 4/m 2/m 2/m
 

Other Pyrope Information
Help on References: References: NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Sinkankas66)
Help on See Also: See Also: Links to other databases for Pyrope :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - CalTech Mineral Spectroscopy 6 - Crocoite.com Mineral Locations 7 - EUROmin Project 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (MinSocAm) 11 -Handbook of Mineralogy (UofA) 12 -MinDAT 13 -MinMax(Deutsch) 14 -MinMax(English) 15 - Mineral and Gemstone Kingdom 16 -Mineral of the Month 17 -Mineralienatlas (Deutsch) 18 -QUT Mineral Atlas 19 - Scandinavian mineral gallery 20 - Tradeshop.com - The Rainbow of Gems 21 - UCLA - Petrography Thin-Sections 22 -University of Colorado - Mineral Structure Data 23 -University of Texas at Austin 24 - WWW-MINCRYST 25 -École des Mines de Paris

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Pyrope

Mg3Al2(SiO4)3
Dana No: 51.4.3a.1 Strunz No: VIII/A.08-10
Locality:

 

Notes:

 
 
   
 
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