Dorrite Mineral Data + Say DORRITE

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General Dorrite Information

Help on Chemical  Formula: Chemical Formula: Ca2Mg2Fe+++4(Al,Fe+++)4Si2O20
Help on Composition: Composition: Molecular Weight = 893.97 gm
   Calcium     8.97 %  Ca   12.55 % CaO
   Magnesium   5.44 %  Mg    9.02 % MgO
   Aluminum    6.04 %  Al   11.41 % Al2O3
   Iron       37.48 %  Fe   53.59 % Fe2O3
   Silicon     6.28 %  Si   13.44 % SiO2
   Oxygen     35.79 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Mg2Fe3+6Al2Si2O20
Help on Environment: Environment: Occurs in a paralava (pyrometamorhic melt rock) formed from burning coal beds.
Help on IMA Status: IMA Status: Approved IMA 1988
Help on Locality: Locality: Druham ranch, 25 km S of Gillette in the Powder River Basin, Wyoming. USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John A. Dorr (1922-1986), University of Michigan.
 

Dorrite Image

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Dorrite

Comments: Dark brown micaceous dorrite (arrow) on matrix.
Location: Eicher, Sattel, Baden-Wurttemberg, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dorrite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.964:1:0.8276
Help on Cell Dimensions: Cell Dimensions: a = 10.505, b = 10.897, c = 9.019, Z = 2; alpha = 106.26°, beta = 95.16°, gamma = 124.75° V = 811.06 Den(Calc)= 3.66
Help on Crystal System: Crystal System: TriclinicSpace Group: P1,P 1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.971(1), 2.515(0.8), 2.558(0.8),
 

Physical Properties of Dorrite

Help on Cleavage: Cleavage: [001] Distinct, [010] Distinct
Help on Color: Color: Brownish black, Dark brown, Reddish brown.
Help on Diaphaniety: Diaphaniety: Subopaque
Help on Fracture: Fracture: Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Sub Metallic
 

Optical Properties of Dorrite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.133 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2295,KC= 0.2648
Help on Optical Data: Optical Data: Biaxial (-), a=1.82, b=1.84, g=1.86, bire=0.0400, 2V(Calc)=88, 2V(Meas)=90.
Help on Pleochroism (x): Pleochroism (x): red-orange brown.
Help on Pleochroism (y): Pleochroism (y): yellowish brown.
Help on Pleochroism (z): Pleochroism (z): greenish brown.
 

Calculated Properties of Dorrite

Help on Electron Density: Electron Density:

relectron=3.55 gm/cc
note: rDorrite =3.66 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01661
Boson Index = 0.98339
Help on Photoelectric: Photoelectric:

PEDorrite = 12.91 barns/electron
U=PEDorrite x relectron= 45.87 barns/cc.

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

Dorrite is Not Radioactive

 

Dorrite Classification

Help on  Dana Class: Dana Class: 69.2.1a.2 (69)Inosilicate Chains with Side Branches or Loops
  (69.2)with P>2
  (69.2.1a)Aenigmatite and related species (Aenigmatite subgroup)
 
69.2.1a.1 Aenigmatite Na2Fe5TiSi6O20 P1 1
 
69.2.1a.2 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri
 
69.2.1a.3 Hogtuvaite (Ca,Na)2(Fe,Fe,Ti,Mg,Mn)6(Si,Be,Al)6O20 P1 1
 
69.2.1a.4 Krinovite NaMg2CrSi3O10 P1 1
 
69.2.1a.5 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1
 
69.2.1a.6 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1
 
69.2.1a.7 Welshite Ca2Mg4(Mn,Fe)Sb2O2[Si3Be2O18] P1 1
 
69.2.1a.8 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1
 
69.2.1a.9 IMA2002-009a! Ca2Fe4FeTiSi4BeAlO20 P1 1
Help on  Strunz Class: Strunz Class: VIII/F.14-40 VIII - Silicates
  VIII/F - Inosilicates (chain and band) modified double chains
  VIII/F.14 - Aenigmatite group
 
VIII/F.14-10 Krinovite NaMg2CrSi3O10 P1 1
 
VIII/F.14-20 Aenigmatite Na2Fe5TiSi6O20 P1 1
 
VIII/F.14-30 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1
 
VIII/F.14-35 Hogtuvaite (Ca,Na)2(Fe,Fe,Ti,Mg,Mn)6(Si,Be,Al)6O20 P1 1
 
VIII/F.14-40 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri
 
VIII/F.14-50 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1
 
VIII/F.14-60 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1
 
VIII/F.14-70 Welshite Ca2Mg4(Mn,Fe)Sb2O2[Si3Be2O18] P1 1
 

Other Dorrite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Dorrite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Print or Cut-and-Paste your Dorrite Specimen Label here :

Dorrite

Ca2Mg2Fe+++4(Al,Fe+++)4Si2O20
Dana No: 69.2.1a.2 Strunz No: VIII/F.14-40
Locality:

 

Notes:

 

 
   
 
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