Pyroaurite Mineral Data

Pyroaurite Mineral Data +

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General Pyroaurite Information

Chemical Formula:

Mg6Fe+++2(CO3)(OH)16·4(H2O)

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

Empirical Formula:

Mg₆Fe³⁺₂(CO₃)(OH)₁₆·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1865

Locality:

Langbanshyttan, Sweden. Link to MinDat.org Location Data.

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.

Synonym:

ICSD 6295

PDF 25-521

Pyroaurite Image

Images:

Pyroaurite

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

Images:

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

Axial Ratios:

a:c = 1:7.51857

Cell Dimensions:

a = 6.19, c = 46.54, Z = 3; V = 1,544.32 Den(Calc)= 2.13

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.77(1), 3.89(0.8), 2.62(0.5),

Crystal Structure:

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Ingram L , Taylor H F W , Mineralogical Magazine , 36 (1967) p.465-479, The crystal structures of sjoegrenite and pyroaurite, Locality: Sweden

Physical Properties of Pyroaurite

Cleavage:

[0001] Perfect

Color:

Brownish yellow, Brown white, Colorless, Greenish, Yellowish white.

Density:

2.07

Diaphaniety:

Transparent

Fracture:

Flexible - Flexible fragments.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5 - Finger Nail

Luster:

Pearly

Streak:

white

Optical Properties of Pyroaurite

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

Optical Data:

Uniaxial (-), e=1.543, w=1.564, bire=0.0210.

Calculated Properties of Pyroaurite

Electron Density:

r_electron=2.11 gm/cc
note: r_Pyroaurite=2.07 gm/cc.

Fermion Index

Fermion Index = 0.02608
Boson Index = 0.97392

Photoelectric:

PE_Pyroaurite= 5.43 barns/electron
U=PE_Pyroaurite x r_electron= 11.48 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pyroaurite is Not Radioactive

Pyroaurite Classification

Dana Class:

16b.6.2.3 (16b)Carbonates - Hydroxyl or Halogen

(16b.6)Dana Type

(16b.6.2)Sjorgrenite-Hydrotalcite Group (Hydrotalcite Subgroup:Rhombohedral)

16b.6.2.1 Hydrotalcite Mg6Al2(CO3)(OH)16·4(H2O) R 3m 3 2/m

16b.6.2.2 Stichtite Mg6Cr2(CO3)(OH)16·4(H2O) R 3m 3 2/m

16b.6.2.3 Pyroaurite Mg6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m

16b.6.2.4 Desautelsite Mg6Mn2(CO3)(OH)16·4(H2O) R 3m or R 3m Trig

Strunz Class:

V/E.03-30 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.03 - Hydrotalcite group

V/E.03-10 Hydrotalcite Mg6Al2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-20 Stichtite Mg6Cr2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-30 Pyroaurite Mg6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-40 Desautelsite Mg6Mn2(CO3)(OH)16·4(H2O) R 3m or R 3m Trig

V/E.03-50 Takovite Ni6Al2(OH)16(CO3,OH)·4(H2O) R 3m 3 2/m

V/E.03-60 Reevesite Ni6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-70 Comblainite Ni6Co2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-80 Sergeevite Ca2Mg11(CO3)9(HCO3)4(OH)4·6(H2O) R 32 3 2

Other Pyroaurite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Pyroaurite

Mg6Fe+++2(CO3)(OH)16·4(H2O)
Dana No: 16b.6.2.3 Strunz No: V/E.03-30
Locality:

Notes: