Pyroaurite Mineral Data

Advertisment

John Betts - Fine Minerals, New York. Dealers of Fine Minerals and Natural Crystal Clusters since 1989. We buy rock collections, we buy gem collections, we buy mineral collections.

Our Mission is Simple: RMS will be the go-to portal for all mineral, gem and rock shows in the USA

Mineral, Fossil, Jewelry, and Lapidary Dealers - Expand your Sales by using Tucson Mall Pop-up Shops

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.

Name Pronunciation:

Pyroaurite + Pronunciation

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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
Ncalc = 1.57 - 1.58

Optical Data:

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

Calculated Properties of Pyroaurite

Electron Density:

Bulk Density (Electron Density)=2.11 gm/cc
note: Specific Gravity of Pyroaurite =2.07 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Pyroaurite= 5.43 barns/electron
U=PE_Pyroaurite x rElectron Density= 11.48 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pyroaurite is Not Radioactive

Pyroaurite Classification

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

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

References:

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

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

Search for Pyroaurite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Pyroaurite :

Adam's Minerals Google Search for Pyroaurite
Dakota Matrix Minerals Google Search for Pyroaurite
John Betts Fine Minerals Search for Pyroaurite
McDougall Minerals Google Search for Pyroaurite
Rock and Mineral Shows Google Search for Pyroaurite
Tucson Mall Google Search for Pyroaurite
Weinrich Minerals, Inc. Google Search for Pyroaurite

Ask about Pyroaurite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: