Mineralogy Database

Pyroaurite Mineral Data

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General Pyroaurite Information

Help on Chemical  Formula: Chemical Formula: Mg6Fe+++2(CO3)(OH)16•4(H2O)
Help on Composition: Composition: Molecular Weight = 661.71 gm
   Magnesium  22.04 %  Mg   36.55 % MgO
   Iron       16.88 %  Fe   24.13 % Fe2O3
   Hydrogen    3.66 %  H    32.67 % H2O
   Carbon      1.82 %  C     6.65 % CO2
   Oxygen     55.61 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg6Fe3+2(CO3)(OH)16•4(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1865
Help on Locality: Locality: Langbanshyttan, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, pyro and the Latin aurium, "fire" and "golden" because of the gold-like submetallic scales present in its type locality.
Help on Name Pronunciation: Name Pronunciation: Pyroaurite + Pronunciation Say PYROAURITE
Help on Synonym: Synonym: ICSD 6295
  PDF 25-521
 

Pyroaurite Image

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  Pyroaurite

Comments: Green, hexagonal plates of pyroaurite in quartz.
Location: Varmland, Sweden. Scale: Crystal size 1 mm.
© Tom Loomis / Dakota Matrix

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  Pyroaurite

Comments: Golden yellow platy crystals of pyroaurite to 1mm on matrix.
Location: Langban mine, Varmland, Sweden. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Pyroaurite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:7.51857
Help on Cell Dimensions: Cell Dimensions: a = 6.19, c = 46.54, Z = 3; V = 1,544.32 Den(Calc)= 2.13
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.77(1), 3.89(0.8), 2.62(0.5),
 

Physical Properties of Pyroaurite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Brownish yellow, Brown white, Colorless, Greenish, Yellowish white.
Help on Density: Density: 2.07
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Pearly
Help on Streak: Streak: white
 

Optical Properties of Pyroaurite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2599,KPDmeas= 0.2674,KC= 0.2742
Ncalc = 1.57 - 1.58
Help on Optical Data: Optical Data: Uniaxial (-), e=1.543, w=1.564, bire=0.0210.
 

Calculated Properties of Pyroaurite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.11 gm/cc
note: Specific Gravity of Pyroaurite =2.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEPyroaurite = 5.43 barns/electron
U=PEPyroaurite x rElectron Density= 11.48 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pyroaurite is Not Radioactive
 

Pyroaurite Classification

Help on  Dana Class: Dana Class: 16b.06.02.03 (16b)Carbonates - Hydroxyl or Halogen
  (16b.06)Dana Type
  (16b.06.02)Sjorgrenite-Hydrotalcite Group (Hydrotalcite Subgroup:Rhombohedral)
 
16b.06.02.01 Hydrotalcite Mg6Al2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
16b.06.02.02 Stichtite Mg6Cr2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
16b.06.02.03 Pyroaurite Mg6Fe2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
16b.06.02.04 Desautelsite Mg6Mn2(CO3)(OH)16•4(H2O) R 3m or R 3m Trig
 
16b.06.02.05 Droninoite! Ni3FeCl(OH)8•2H2O R 3m, R 3m or R 32 Trig
Help on  Strunz Class: Strunz Class: 05.DA.50 05 - CARBONATES (NITRATES)
  05.D - Carbonates with Additional Anions, with H2O
  05.DA -With medium-sized cations
 
05.DA.50 Desautelsite Mg6Mn2(CO3)(OH)16•4(H2O) R 3m or R 3m Trig
 
05.DA.50 Comblainite Ni6Co2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Hydrotalcite Mg6Al2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Pyroaurite Mg6Fe2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Reevesite Ni6Fe2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Stichtite Mg6Cr2(CO3)(OH)16•4(H2O) R 3m 3 2/m
 
05.DA.50 Takovite Ni6Al2(OH)16(CO3,OH)•4(H2O) R 3m 3 2/m
 

Other Pyroaurite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Pyroaurite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - HyperPhysics
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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

Pyroaurite

Mg6Fe+++2(CO3)(OH)16•4(H2O)
Dana No: 16b.06.02.03 Strunz No: 05.DA.50
Locality:

 

Notes:

 

 
   
 


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