Strontiomelane Mineral Data

[New Updates] [Gallery 1] [Gallery 2] [Gallery 3] [Rock Shop Gallery]
Serving the mineral collector and educator community since 1970
Over 900,000 mineral specimens in stock
New minerals acquired weekly - Wright's Rock Shop

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

Strontiomelane Image

Images:

Strontiomelane

Comments: BSE image of strontiomelane. (CanMin, v37:673).
Location: Praboma mine near Saint-Marcel, Aosta Valley, Italian Alps, Italy. Scale: Scale Bar 100 µm.
© Canadian Mineralogist

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.

Diaphaneity:

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

Optical Data:

NCalc= 2.56 - from Gladstone-Dale relationship (KC = 0.3423) where Ncalc=Dcalc*KC+1

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:

Bulk Density (Electron Density)=4.27 gm/cc
note: Specific Gravity of Strontiomelane =4.57 gm/cc.

Fermion Index:

Fermion Index = 0.0079889633
Boson Index = 0.9920110367

Photoelectric:

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

Radioactivity:

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

Strontiomelane Classification

Dana Class:

07.09.01.05 (07)Multiple Oxides

(07.09)Dana Type

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

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

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

07.09.01.03 Manjiroite (Na,K)(Mn,Mn)8O16•n(H2O) I 4/m 4/m

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

07.09.01.05 Strontiomelane! SrMn6Mn2O16 P 2₁/m 2/m

07.09.01.06 Henrymeyerite! BaFeTi7O16 I 4/m 4/m

Strunz Class:

04.DK.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DK -With large (± medium-sized) cations; tunnel structures

04.DK.10 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m

04.DK.10 Todorokite (Na,Ca,K)2(Mn,Mn)6O12•3-4.5(H2O) P 2/m 2/m

04.DK.10 Romanechite (Ba,H2O)2(Mn,Mn)5O10 C 2/m 2/m

04.DK.10 Strontiomelane! SrMn6Mn2O16 P 2₁/m 2/m

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 (MinSocAm)
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info

Search for Strontiomelane using:

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

Visit our Advertisers for Strontiomelane :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Diamond Dan Publications

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

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: 07.09.01.05 Strunz No: 04.DK.10
Locality:

Notes: