Mineralogy Database

Pyrope Mineral Data

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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 Name Pronunciation: Name Pronunciation: Pyrope Say PYROPE
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 - Hexoctahedral H-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),
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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 Diaphaneity: Diaphaneity: 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: Non-fluorescent.
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
Ncalc = 1.73 - 1.79
Help on Optical Data: Optical Data: Isotropic, n=1.73-1.76.
 

Calculated Properties of Pyrope

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.53 gm/cc
note: Specific Gravity of Pyrope =3.56 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEPyrope = 1.59 barns/electron
U=PEPyrope x rElectron Density= 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: 51.04.03a.01 (51)Nesosilicate Insular SiO4 Groups Only
  (51.04)with cations in [6] and >[6] coordination
  (51.04.03a)Garnet group (Pyralspite series)
 
51.04.03a.01 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03a.02 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03a.03 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03a.04 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03a.05 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m
 
51.04.03a.06 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 09.AD.25 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AD -Nesosilicates without additional anions;
 
09.AD.25 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m
 
09.AD.25 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 41/acd 4/m 2/m 2/m
 
09.AD.25 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m
 
09.AD.25 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m
 
09.AD.25 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m
 
09.AD.25 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m
 
09.AD.25 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Wadalite Ca6Al5Si2O16Cl3 I 43d 4 3m
 
09.AD.25 Holtstamite! Ca3(Al,Mn)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 - Athena
4 - CalTech Mineral Spectroscopy
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineral and Gemstone Kingdom
14 - Mineral of the Month
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info
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

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Pyrope

Mg3Al2(SiO4)3
Dana No: 51.04.03a.01 Strunz No: 09.AD.25
Locality:

 

Notes:

 

 
   
 


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