Strontiomelane Mineral Data

Strontiomelane Mineral Data

[Newest Minerals] [Rare Minerals] [Past Sale Items] [About Us] [A-Rocks Auctions]
T G Fine Minerals sells Australian Minerals from all the classic and current localities
We are one the most comprehensive sellers of these (Aussie) minerals in the world
Broken Hill specimens are our specialty along with fine worldwide minerals, Australian opals, fossils & gems

General Strontiomelane Information

Chemical Formula:

SrMn++++6Mn+++2O16

Composition:

Molecular Weight = 783.11 gm

Strontium 11.19 % Sr 13.23 % SrO

Manganese 56.12 % Mn 20.16 % Mn₂O₃ / 66.61 % MnO₂

Oxygen 32.69 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

SrMn⁴⁺₆Mn³⁺₂O₁₆

Environment:

Post-Alpine stage of veining. Sr end-member of the cryptomelane group.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Found at the Praborna manganese mine, near Saint-Marcel, Aosta Valley, Italian Alps. Link to MinDat.org Location Data.

Name Origin:

The name reflects the presence of strontium and the black color, melanos in Greek.

Synonym:

IMA1995-005

Search for Strontiomelane Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Strontiomelane Crystallography

Axial Ratios:

a:b:c =1.7367:1:1.7158

Cell Dimensions:

a = 10, b = 5.758, c = 9.88, Z = 2; beta = 90.64° V = 568.85 Den(Calc)= 4.57

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 3.15(1)(103), 3.13(0.8)(103), 2.409(0.8)(122),2.17(0.6)(320), 1.556(0.5)(225),

Physical Properties of Strontiomelane

Cleavage:

[???] Distinct

Color:

Black.

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Sub Metallic

Streak:

sepia brown

Optical Properties of Strontiomelane

RL Anisotrophism:

Moderate, from gray-blue to white.

RL Color:

Gray color in oil.

RL Pleochroism:

Strong gray-white in oil.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Strontiomelane in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	34.20	26.00
543 nm	31.70	24.40
587 nm	30.60	23.40
657 nm	29.70	22.30

**Calculated Relative Intensity Colors of Strontiomelane in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	360%	380%
R₁
R₂

Calculated Properties of Strontiomelane

Electron Density:

r_electron=4.27 gm/cc
note: r_{Strontiomelane}=4.57 gm/cc.

Fermion Index

Fermion Index = 0.00798
Boson Index = 0.99202

Photoelectric:

PE_{Strontiomelane}= 27.51 barns/electron
U=PE_{Strontiomelane} x r_electron= 117.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Strontiomelane is Not Radioactive

Strontiomelane Classification

Dana Class:

7.9.1.5 (7)Multiple Oxides

(7.9)where A B (O)2

(7.9.1)Cryptomelane Group (Hard black, fine-grained)

7.9.1.1 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m

7.9.1.2 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m

7.9.1.3 Manjiroite (Na,K)(Mn,Mn)8O16·n(H2O) I 4/m 4/m

7.9.1.4 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m

7.9.1.5 Strontiomelane ! SrMn6Mn2O16 P 2₁/m 2/m

7.9.1.6 Henrymeyerite! BaFeTi7O16 I 4/m 4/m

Strunz Class:

IV/D.08-25 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.08 - Cryptomelane group

IV/D.08-10 Manjiroite (Na,K)(Mn,Mn)8O16·n(H2O) I 4/m 4/m

IV/D.08-20 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m

IV/D.08-25 Strontiomelane SrMn6Mn2O16 P 2₁/m 2/m

IV/D.08-30 Priderite (K,Ba)(Ti,Fe)8O16 I 4/m 4/m

IV/D.08-33 Henrymeyerite! BaFeTi7O16 I 4/m 4/m

IV/D.08-35 Ankangite Ba(Ti,V,Cr)8O16 I 4/m 4/m

IV/D.08-40 Mannardite BaTi6V2O16·(H2O) I 4₁/a 4/m

IV/D.08-50 Redledgeite BaTi6Cr2O16·(H2O) I 4₁/a 4/m

IV/D.08-60 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m

IV/D.08-70 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m

IV/D.08-80 Cesarolite PbH2Mn3O8 HEX-R Trig

Other Strontiomelane Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(AmMin, V 85, p628) OPTIC PROP.(AmMin, V 85, p628)

See Also:

Links to other databases for Strontiomelane :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

Search for Strontiomelane using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Strontiomelane :
AA Mineral Specimens
B and L Minerals
Crystal Vaults
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Strontiomelane Mineral Data :

Ask about Strontiomelane 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 Strontiomelane Specimen Label here :

Strontiomelane

SrMn++++6Mn+++2O16
Dana No: 7.9.1.5 Strunz No: IV/D.08-25
Locality:

Notes: