Manganipiemontite-(Sr) Mineral Data

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General Manganipiemontite-(Sr) Information

Chemical Formula:

CaSr(Mn+++,Fe+++)2Al[Si3O12](OH)

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

Empirical Formula:

CaSrMn³⁺_1.5Al_0.3Fe³⁺_0.4Al(Si₃O₁₂)(OH)_0.9

Environment:

Calc-silicate rocks formed by hydrothermal alteration of Mn ores. Epidote Group.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Wessels mine, Kalahari manganese fields, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for Samuel M. Tweddill, first curator (1897 to 1915) of the Museum of the Geological Survey, Pretoria, Republic of South Africa.

Synonym:

IMA2001-014

Tweddillite - Renamed to Manganipiemontite-(Sr) - Recommended nomenclature of epidote-group minerals, Eur. J. Mineral. 2006, 18, 551-567.

Manganipiemontite-(Sr) Image

Images:

Manganipiemontite-(Sr)

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

Axial Ratios:

a:b:c =1.5675:1:1.8094

Cell Dimensions:

a = 8.932, b = 5.698, c = 10.31, Z = 2; beta = 114.56° V = 477.25 Den(Calc)= 3.89

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): 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)

Cleavage:

{001} Perfect

Color:

Deep red.

Diaphaneity:

Transparent

Fracture:

Brittle - Subconchoidal - Brittle frature with subconchoidal fragments

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Vitreous (Glassy)

Streak:

brownish red

Optical Properties of Manganipiemontite-(Sr)

Gladstone-Dale:

CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2121,KC= 0.2262
Ncalc = 1.88

Optical Data:

Biaxial (+), b=1.825

Calculated Properties of Manganipiemontite-(Sr)

Electron Density:

Bulk Density (Electron Density)=3.74 gm/cc
note: Specific Gravity of Manganipiemontite-(Sr) =3.89 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Manganipiemontite-(Sr)}= 23.90 barns/electron
U=PE_{Manganipiemontite-(Sr)} x rElectron Density= 89.44 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Manganipiemontite-(Sr) is Not Radioactive

Manganipiemontite-(Sr) Classification

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

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

References:

NAME( AmMin, Vol 88, p 253) PHYS. PROP.(AmMin, Vol 88, p 253) OPTIC PROP.(AmMin, Vol 88, p 253)

See Also:

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

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Manganipiemontite-(Sr)

CaSr(Mn+++,Fe+++)2Al[Si3O12](OH)
Dana No: 58.02.01a.07 Strunz No: 09.BG.05a
Locality:

Notes: