Aurorite Mineral Data

Aurorite Mineral Data +

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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.

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

Diaphaniety:

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

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:

r_electron=3.56 gm/cc
note: r_Aurorite=3.70 gm/cc.

Fermion Index

Fermion Index = 0.00022
Boson Index = 0.99978

Photoelectric:

PE_Aurorite= 31.99 barns/electron
U=PE_Aurorite x r_electron= 113.76 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Aurorite is Not Radioactive

Aurorite Classification

Dana Class:

7.8.2.2 (7)Multiple Oxides

(7.8)where A B (O)2·x(H2O)

(7.8.2)Dana Group

7.8.2.1 Chalcophanite (Zn,Fe,Mn)Mn3O7·3(H2O) R 3 3

7.8.2.2 Aurorite (Mn,Ag,Ca)Mn3O7·3(H2O) P1 1

7.8.2.3 Jianshuiite (Mg,Mn)Mn3O7·3(H2O) R 3 or R 3 Trig

7.8.2.4 Ernienickelite NiMn3O7·3(H2O) R 3 or R 3 Trig

Strunz Class:

IV/F.11-10 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.11 - Jiansuiite - Birnessite series

IV/F.11-05 Jianshuiite (Mg,Mn)Mn3O7·3(H2O) R 3 or R 3 Trig

IV/F.11-10 Aurorite (Mn,Ag,Ca)Mn3O7·3(H2O) P1 1

IV/F.11-15 Ernienickelite NiMn3O7·3(H2O) R 3 or R 3 Trig

IV/F.11-20 Chalcophanite (Zn,Fe,Mn)Mn3O7·3(H2O) R 3 3

IV/F.11-25 Cianciulliite Mn(Mg,Mn)2Zn2(OH)10·2-4(H2O) C 2/m 2/m

IV/F.11-30 Birnessite (Na,Ca,K)x(Mn,Mn)2O4·1.5(H2O) C 2/m 2/m

Other Aurorite Information

References:

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

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

Aurorite

(Mn,Ag,Ca)Mn++++3O7·3(H2O)
Dana No: 7.8.2.2 Strunz No: IV/F.11-10
Locality:

Notes: