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Aurorite Mineral Data

️Dave Barthelmy

General Aurorite Information

Chemical Formula:

(Mn,Ag,Ca)Mn++++3O7•3(H2O)

Composition:

Molecular Weight = 398.70 gm

Calcium 2.01 % Ca 2.81 % CaO

Manganese 48.23 % Mn 8.90 % MnO / 65.42 % MnO₂

Silver 8.12 % Ag 8.72 % Ag₂O

Hydrogen 1.52 % H 13.56 % H₂O

Oxygen 40.13 % O

______ ______

100.00 % 99.40 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.5Ag_0.3Ca_0.2Mn⁴⁺₃O₇•3(H₂O)

Environment:

In veinlets filling microfractures in manganoan calcite.

IMA Status:

Approved IMA 1967

Locality:

Aurora mine, Treasure Hill, Hamilton, Nevada, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Aurorite

Aurorite Image

Images:

Aurorite

Comments: Brown, dendritic aurorite in white calcite.
Location: Aurora Mine, Hamilton, White Pine County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Aurorite Crystallography

Axial Ratios:

a:b:c =1:1:1.0889

Cell Dimensions:

a = 7.53, b = 7.53, c = 8.2, Z = 2; alpha = 90°, beta = 117.2°, gamma = 120° V = 358.13 Den(Calc)= 3.70

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 6.94(1), 3.46(0.7), 4.06(0.5),

Physical Properties of Aurorite

Color:

Grayish black, Black.

Density:

3.8 - 4.1, Average = 3.95

Diaphaneity:

Opaque

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Scaly - Morphology like fish scales.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Metallic

Streak:

brown

Optical Properties of Aurorite

Gladstone-Dale:

CI meas= 0.26 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.244 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2584,KPDmeas= 0.2532,KC= 0.3419
Ncalc = 2.3 - 2.4

Optical Data:

Biaxial (?), a=2

RL Anisotrophism:

Yellow-gray to brownish gray.

RL Bireflectance:

Strong, cream white to medium black.

Reflectivity

Standardized Intensity (100%) Reflection Spectra of Aurorite in Air

λ	R₁	R₂		∑ R₁(λ)	∑ R₂(λ)
400 nm	10.40	36.50

420 nm

10.30

35.30

440 nm

10.20

34.00

460 nm

9.99

32.40

480 nm

9.67

30.60

500 nm

9.49

29.20

520 nm

9.31

27.80

540 nm

9.16

26.60

560 nm

9.11

25.60

580 nm

8.93

24.90

600 nm

8.88

24.50

620 nm

8.87

24.00

640 nm

8.85

23.70

660 nm

8.84

23.40

680 nm

8.82

22.90

700 nm

8.80

22.70

Calculated Relative Intensity Colors of Aurorite in Air

Relative Intensity	0%	100%	200%	300%	400%	500%	600%	700%	800%	900%	970%
R₁
R₂

Calculated Properties of Aurorite

Electron Density: Bulk Density (Electron Density)=3.72 gm/cc
note: Specific Gravity of Aurorite =3.87 gm/cc.

Fermion Index: Fermion Index = 0.0002220344
Boson Index = 0.9997779656

Photoelectric: PE_Aurorite= 31.99 barns/electron
U=PE_Aurorite x rElectron Density= 118.99 barns/cc.

Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Aurorite is Not Radioactive

Aurorite Classification

Dana Class: 07.08.02.02 (07)Multiple Oxides (07.08)where A B (O)2·x(H2O) (07.08.02)Chalcophanite Group

07.08.02.01 Chalcophanite (Zn,Fe,Mn)Mn3O7•3(H2O) R 3 3

07.08.02.02 Aurorite (Mn,Ag,Ca)Mn3O7•3(H2O) P1 1

07.08.02.03 Jianshuiite (Mg,Mn)Mn3O7•3(H2O) R 3 or R 3 Trig

07.08.02.04 Ernienickelite NiMn3O7•3(H2O) R 3 or R 3 Trig

Strunz Class: 04.FL.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate 04.F - Hydroxides (without V or U) 04.FL -Hydroxides with H2O ± (OH); sheets of edge-sharing octahedra

04.FL.20 Aurorite (Mn,Ag,Ca)Mn3O7•3(H2O) P1 1

04.FL.20 Chalcophanite (Zn,Fe,Mn)Mn3O7•3(H2O) R 3 3

04.FL.20 Ernienickelite NiMn3O7•3(H2O) R 3 or R 3 Trig

04.FL.20 Jianshuiite (Mg,Mn)Mn3O7•3(H2O) R 3 or R 3 Trig

Other Aurorite Information

References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)

See Also: Links to other databases for Aurorite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

Search for Aurorite using:

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Ask about Aurorite 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 Aurorite Specimen Label here :

Aurorite

(Mn,Ag,Ca)Mn++++3O7•3(H2O)
Dana No: 07.08.02.02 Strunz No: 04.FL.20
Locality:

Notes: