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Manganipiemontite-(Sr) Mineral Data

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General Manganipiemontite-(Sr) Information

Help on Chemical  Formula: Chemical Formula: CaSr(Mn+++,Fe+++)2Al[Si3O12](OH)
Help on Composition: Composition: Molecular Weight = 559.08 gm
   Strontium  15.67 %  Sr   18.53 % SrO
   Calcium     7.17 %  Ca   10.03 % CaO
   Manganese  14.74 %  Mn   21.18 % Mn2O3
   Aluminum    6.27 %  Al   11.85 % Al2O3
   Iron        4.00 %  Fe    5.71 % Fe2O3
   Silicon    15.07 %  Si   32.24 % SiO2
   Hydrogen    0.16 %  H     1.45 % H2O
   Oxygen     36.92 %  O
             ______        ______ 
             100.00 %      101.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaSrMn3+1.5Al0.3Fe3+0.4Al(Si3O12)(OH)0.9
Help on Environment: Environment: Calc-silicate rocks formed by hydrothermal alteration of Mn ores. Epidote Group.
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Wessels mine, Kalahari manganese fields, South Africa. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Samuel M. Tweddill, first curator (1897 to 1915) of the Museum of the Geological Survey, Pretoria, Republic of South Africa.
Help on Synonym: Synonym: IMA2001-014
  Tweddillite - Renamed to Manganipiemontite-(Sr) - Recommended nomenclature of epidote-group minerals, Eur. J. Mineral. 2006, 18, 551-567.

Manganipiemontite-(Sr) Image

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Comments: Thin-section of (100) twinned tweddillite blades (red-orange-magenta ) in a matrix of serandite-pectolite (white-grey-yellow). Crossed polarizers. (MinMag 66:144).
Location: Kalahari manganese fields (Republic of South Africa). Scale: Picture Size 1 mm.
© Mineralogical Magazine

Manganipiemontite-(Sr) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5675:1:1.8094
Help on Cell Dimensions: Cell Dimensions: a = 8.932, b = 5.698, c = 10.31, Z = 2; beta = 114.56° V = 477.25 Den(Calc)= 3.89
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.936(1)(113), 2.182(0.8)(401), 2.586(0.8)(202),2.703(0.8)(300), 3.513(0.5)(211), 2.149(0.4)(221), 2.854(0.4)(020), 2.415(0.3),

Physical Properties of Manganipiemontite-(Sr)

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Deep red.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Subconchoidal - Brittle frature with subconchoidal fragments
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 6-7 - Orthoclase-Quartz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: brownish red

Optical Properties of Manganipiemontite-(Sr)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2121,KC= 0.2262
Ncalc = 1.88
Help on Optical Data: Optical Data: Biaxial (+), b=1.825

Calculated Properties of Manganipiemontite-(Sr)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.74 gm/cc
note: Specific Gravity of Manganipiemontite-(Sr) =3.89 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEManganipiemontite-(Sr) = 23.90 barns/electron
U=PEManganipiemontite-(Sr) x rElectron Density= 89.44 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Manganipiemontite-(Sr) is Not Radioactive

Manganipiemontite-(Sr) Classification

Help on  Dana Class: Dana Class: 58.02.01a.07 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)
  (58.02.01a)Epidote group (Clinozoisite subgroup)
58.02.01a.01 Clinozoisite! Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 21/m 2/m
58.02.01a.02 Epidote! Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
58.02.01a.03 Epidote-(Pb)! (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 21/m 2/m
58.02.01a.04 Mukhinite Ca2Al2V(SiO4)3(OH) P 21/m 2/m
58.02.01a.05 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
58.02.01a.06 Piemontite-(Sr)! (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 21/m 2/m
58.02.01a.07 Manganipiemontite-(Sr)! CaSr(Mn,Fe)2Al[Si3O12](OH) P 21/m 2/m
58.02.01a.08 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 21/a 2/m
58.02.01a.09 Clinozoisite-(Sr)! CaSrAl3(Si2O7)(SiO4)O(OH) P 21/m 2/m
58.02.01a.10 Uedaite-(Ce)! MnCeAl2Fe(Si2O7)(SiO4)O(OH) P 21/m 2/m
58.02.01a.11 Epidote-(Sr)! CaSrAl2Fe(Si2O7)(SiO4)O(OH) P 21/m 2/m
Help on  Strunz Class: Strunz Class: 09.BG.05a 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;
09.BG.05a Clinozoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 21/m 2/m
09.BG.05a Epidote Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
09.BG.05a Epidote-(Pb) (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 21/m 2/m
09.BG.05a Mukhinite Ca2Al2V(SiO4)3(OH) P 21/m 2/m
09.BG.05a Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
09.BG.05a Piemontite-(Sr)! (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 21/m 2/m
09.BG.05a Manganipiemontite-(Sr)! CaSr(Mn,Fe)2Al[Si3O12](OH) P 21/m 2/m
09.BG.05a Clinozoisite-(Sr)! CaSrAl3(Si2O7)(SiO4)O(OH) P 21/m 2/m
09.BG.05a Epidote-(Sr)! CaSrAl2Fe(Si2O7)(SiO4)O(OH) P 21/m 2/m

Other Manganipiemontite-(Sr) Information

Help on References: References: NAME( AmMin, Vol 88, p 253) PHYS. PROP.(AmMin, Vol 88, p 253) OPTIC PROP.(AmMin, Vol 88, p 253)
Help on See Also: See Also: Links to other databases for Manganipiemontite-(Sr) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: 58.02.01a.07 Strunz No: 09.BG.05a





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