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Ferro-tschermakite

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Gustav Tschermak
Formula:
☐{Ca2}{Fe32+Al2}(Al2Si6O22)(OH)2
Ferro-tschermakite is defined as a tschermakite group member with the following dominant elements:
C position: Fe as the dominant divalent cation and Al as the dominant trivalent cation.
W position: (OH) as the dominant anion
System:
Monoclinic
Colour:
Medium green to dark ...
Lustre:
Vitreous
Hardness:
5 - 6
Name:
For its iron-rich relationship to Tschermakite, named for Gustav Tschermak.
Ferrotschermakite is defined as a Tschermakite Group memeber with Fe2+>Mg and Al>Fe3+ in the C position. Ferrotschermakite has been redefined in the 2012 Amphibole nomenclature in that:


1) The formula is changed from ☐(Ca2)(Fe2+3AlFe3+)(Al2Si6O22)(OH)2 to ☐(Ca2)(Fe2+3Al2)(Al2Si6O22)(OH)2. Consequently all pre-2012 literature references to ferrotschermakite should be checked to verify that Al>Fe3+ in the C position. If Fe3+>Al in the C position the material will be ferro-ferri-tschermakite.

2) The tschermakite group is in the 2012 nomenclature defined with C(Al+Fe3++2Ti)>1,5 apfu, whereas the pre-2012 definition was defined with 5,5 < Si < 6,5 apfu. This redefinition does not change the formula, but many amphiboles qualifying as tschermakite pre-2012 will now be ferro-hornblende or ferro-ferrihornblende.


It should also be noted that pre-1978 tschermakite was defined with A+B(Na+K+Ca)<2,5. As tschermakite often contains less than 2apfu Ca, older literature may describe amphiboles with A(Na+K)>0,5 as tschermakites. These are now considered pargasites

Classification of Ferro-tschermakite

Published without Approval
Explanation of status:
Ferro-tschermakite was redefined by Hawthorne et.al(2012), and no type description on the redefined material has been made. Status as pr. 2014 is "named"
9.DE.10

9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
16.21.3

16 : Silicates Containing Aluminum and other Metals
21 : Aluminosilicates of Fe and Ca
mindat.org URL:
http://www.mindat.org/min-1532.html
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Physical Properties of Ferro-tschermakite

Vitreous
Colour:
Medium green to dark green to green-black to black, also brownish-green.
Streak:
Pale grey-green
Hardness (Mohs):
5 - 6
Cleavage:
Perfect
on {110}

Crystallography of Ferro-tschermakite

Crystal System:
Monoclinic
Cell Parameters:
a = 9.86Å, b = 18.13Å, c = 5.33Å
β = 104.95°
Ratio:
a:b:c = 0.544 : 1 : 0.294
Unit Cell Volume:
V 920.55 ų (Calculated from Unit Cell)

Optical Data of Ferro-tschermakite

Type:
Biaxial (-)
RI values:
nα = 1.720 nγ = 1.750
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively strong

Chemical Properties of Ferro-tschermakite

Formula:
☐{Ca2}{Fe32+Al2}(Al2Si6O22)(OH)2

Ferro-tschermakite is defined as a tschermakite group member with the following dominant elements:
C position: Fe as the dominant divalent cation and Al as the dominant trivalent cation.
W position: (OH) as the dominant anion
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Mn,Na,K,F,Cl,Mg,Fe2+

Relationship of Ferro-tschermakite to other Species

Series:
Forms a series with Tschermakite (see here)
Other Members of Group:
Ferri-fluoro-tschermakite☐{Ca2}{Mg3Fe23+}(Al2Si6O22)F2
Ferri-tschermakite☐{Ca2}{Mg3Fe23+}(Al2Si6O22)(OH)2
Ferro-ferri-fluoro-tschermakite☐{Ca2}{Fe32+Fe23+}(Al2Si6O22)F2
Ferro-Ferri-tschermakite☐{Ca2}{Fe32+Fe23+}(Al2Si6O22)(OH)2
Ferro-fluoro-tschermakite☐{Ca2}{Fe32+Al}2(Al2Si6O22)F2
Fluoro-tschermakite☐{Ca2}{Mg3Al2}(Al2Si6O22)F2
Tschermakite☐(Ca2)(Mg3Al2)(Al2Si6O22)(OH)2
9.DE.05Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2
9.DE.05Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
9.DE.05Clino-holmquistite Root Name☐{Li2}{Z32+Z23+}(Si8O22)(OH,F,Cl)2
9.DE.05Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
9.DE.05Manganocummingtonite☐{Mn22+}{Mg5}(Si8O22)(OH)2
9.DE.05Manganogrunerite☐{Mn22+}{Fe52+}(Si8O22)(OH)2
9.DE.05Permanganogrunerite☐{Mn22+}{Mn52+}(Si8O22)(OH)2
9.DE.05Ferro-fluoro-pedrizite{Na}{Li2}{Fe2Al2Li}(Al2Si6O22)F2
9.DE.05Ferri-fluoro-leakeite{Na}{Na2}{Mg2Fe23+Li}(Si8O22)F2
9.DE.10Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
9.DE.10Ferri-tschermakite☐{Ca2}{Mg3Fe23+}(Al2Si6O22)(OH)2
9.DE.10Ferro-actinolite☐{Ca2}{Fe52+}(Si8O22)(OH)2
9.DE.10Ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
9.DE.10Joesmithite{Pb}{Ca2}{Mg3Fe23+}(Be2Si6O22)(OH)2
9.DE.10Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
9.DE.10Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
9.DE.10Tschermakite☐(Ca2)(Mg3Al2)(Al2Si6O22)(OH)2
9.DE.10CannilloiteCa(Ca2)(Mg4Al)(Al3Si5O22)(OH)2
9.DE.10Fluoro-cannilloite{Ca}{Ca2}{Mg4Al}(Al3Si5O22)(F,OH)2
9.DE.10Parvo-manganotremolite☐{CaMn2+}{Mg5}(Si8O22)(OH)2
9.DE.10Fluoro-tremolite☐{Ca2}{Mg5}(Si8O22)F2
9.DE.10Potassic-fluoro-pargasite{K}{Ca2}{Mg4Al}(Al2Si6O22)F2
9.DE.15Edenite{Na}{Ca2}{Mg5}(AlSi7O22)(OH)2
9.DE.15Ferro-edenite{Na}{Ca2}{Fe52+}(AlSi7O22)(OH)2
9.DE.15Ferro-kaersutite{Na}{Ca2}{Fe32+AlTi}(Al2Si6O22)O2
9.DE.15Ferro-pargasite{Na}{Ca2}{Fe42+Al}(Al2Si6O22)(OH)2
9.DE.15Hastingsite{Na}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(OH)2
9.DE.15Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
9.DE.15Magnesio-hastingsite{Na}{Ca2}{Mg4Fe3+}(Al2Si6O22)(OH)2
9.DE.15Pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
9.DE.15Sadanagaite{Na}{Ca2}{Mg3Al2}(Al3Si5O22)(OH)2
9.DE.15Fluoro-edenite{Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2
9.DE.15Potassic-ferro-ferri-sadanagaite{K}{Ca2}{Fe32+Fe23+}(Al3Si5O22)(OH)2
9.DE.15Potassic-sadanagaite{K}{Ca2}{Mg3Al2}(Al3Si5O22)(OH)2
9.DE.15Potassic-pargasite{K}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
9.DE.15Potassic-ferro-sadanagaite{K}{Ca2}{Fe32+Al2}(Al3Si5O22)(OH)2
9.DE.15Fluoro-magnesio-hastingsite{Na}{Ca2}{Mg4Fe3+}(Al2Si6O22)F2
9.DE.15Potassic-fluoro-hastingsite{K}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(F,OH)2
9.DE.15Potassic-chloro-hastingsite{K}{Ca2}{Fe42+Fe3+}(Al2Si6O22)(Cl,OH)2
9.DE.15Fluoro-pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(F,OH)2
9.DE.15Parvo-mangano-edenite{Na}{CaMn2+}{Mg5}(AlSi7O22)(OH)2
9.DE.15Potassic-chloro-pargasite{K}{Ca2}{Mg4Al}(Al2Si6O22)(Cl,OH)2
9.DE.15Potassic-ferro-chloro-edenite{K}{Ca2}{Fe52+}(AlSi7O22)(Cl,OH)2
9.DE.15Potassic-magnesio-hastingsite{K}{Ca2}{Mg4Fe3+}(Al2Si6O22)(OH)2
9.DE.15Potassic-ferro-pargasite{K}{Ca2}{Fe42+Al}(Al2Si6O22)(OH)2
9.DE.15Chromio-pargasite{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2
9.DE.20Ferro-taramiteNa(CaNa)(Fe32+Al2)(Al2Si6O22)(OH)2
9.DE.20Barroisite☐{CaNa}{Mg3Al2}(AlSi7O22)(OH)2
9.DE.20Ferro-ferri-barroisite☐(CaNa)(Fe32+Fe23+)(AlSi7O22)(OH)2
9.DE.20Ferro-ferri-winchite☐[CaNa][Fe42+(Fe3+,Al)]Si8O22(OH)2
9.DE.20Ferri-barroisite☐(CaNa)(Mg3Fe23+)(AlSi7O22)(OH)2
9.DE.20Ferro-ferri-taramiteNa(CaNa)(Fe32+Fe23+)(Al2Si6O22)(OH)2
9.DE.20Ferro-ferri-katophoriteNaCaNaFe42+(Fe3+)[(AlSi7)O22](OH)2
9.DE.20Ferro-barroisite☐{CaNa}{Fe32+Al2}(AlSi7O22)(OH)2
9.DE.20Ferro-richterite{Na}{CaNa}{Fe52+}(Si8O22)(OH)2
9.DE.20Ferro-winchite ☐{CaNa}{Fe42+Al}(Si8O22)(OH)2
9.DE.20Ferro-katophorite{Na}{CaNa}{Fe42+Al}[(AlSi7)O22](OH)2
9.DE.20Ferri-taramiteNa(CaNa)(Mg3Fe23+)(Al2Si6O22)(OH)2
9.DE.20Magnesiotaramite{Na}{CaNa}{Mg3AlFe3+}(Al2Si6O22)(OH)2
9.DE.20Richterite{Na}{CaNa}{Mg5}(Si8O22)(OH)2
9.DE.20Winchite☐{CaNa}{Mg4Al}(Si8O22)(OH)2
9.DE.20Taramite{Na}{CaNa}{Mg3Al2}(Al2Si6O22)(OH)2
9.DE.20Fluoro-richterite{Na}{CaNa}{Mg5}(Si8O22)(F,OH)2
9.DE.20Katophorite{Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2
9.DE.20Potassic-fluoro-richterite{K}{CaNa}{Mg5}(Si8O22)(F,OH)2
9.DE.20Potassic-richteriteK[CaNa][Mg5]Si8O22(OH)2
9.DE.20Ferri-ghoseite☐[Mn2+Na][Mg4Fe3+]Si8O22(OH)2
9.DE.20Ferri-winchite☐[CaNa][Mg4(Fe3+,Al)]Si8O22(OH)2
9.DE.20Fluoro-taramite{Na}{CaNa}{Mg3Al2}(Al2Si6O22)F2
9.DE.25Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
9.DE.25EckermanniteNaNa2(Mg4Al}Si8O22(OH)2
9.DE.25Ferro-eckermanniteNaNa2(Fe2+,4Al)Si8O22(OH)2
9.DE.25Ferro-glaucophane◻[Na2][Fe32+Al2]Si8O22(OH)2
9.DE.25Glaucophane◻[Na2][Mg3Al2]Si8O22(OH)2
9.DE.25Potassic-mangani-leakeite[(Na,K)][Na2][Mg2Mn23+Li]Si8O22(OH)2
9.DE.25Mangano-ferri-eckermannite[Na][Na2][Mn42+(Fe3+)]Si8O22(OH)2
9.DE.25Ferri-leakeite[Na][Na2][Mg2Fe23+Li]Si8O22(OH)2
9.DE.25Magnesio-riebeckite◻{Na2}{Mg3Fe23+}(Si8O22)(OH)2
9.DE.25Magnesio-arfvedsonite{Na}{Na2}{Mg4Fe3+}(Si8O22)(OH)2
9.DE.25NybøiteNaNa2(Mg3Al2)(AlSi7O22)(OH)2
9.DE.25Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
9.DE.25Mangano-mangani-ungarettiiteNaNa2(Mn22+Mn33+)(Si8O22)O2
9.DE.25Ferro-ferri-nybøiteNaNa2[(Fe32+,Mg)Fe23+](AlSi7O22)(OH)2
9.DE.25Clino-ferro-ferri-holmquistite◻{Li2}{Fe32+Fe23+}(Si8O22)(OH)2
9.DE.25Ferri-nybøiteNaNa2(Mg3Fe23+](AlSi7O22)(OH)2
9.DE.25Ferro-ferri-leakeite[Na][Na2][Fe22+Fe23+Li]Si8O22(OH)2
9.DE.25Ferro-ferri-fluoro-leakeiteNa(Na2)(Fe22+Fe23+Li)(Si8O22)(F)2
9.DE.25Sodic-ferri-clinoferroholmquistiteNa0.5{Li2}{Fe32+Fe23+}(Si8O22)(OH)2
9.DE.25Magnesio-fluoro-arfvedsonite[Na][Na2][Mg4Fe3+][Si8O22](F,OH)2
9.DE.25Ferri-pedrizite[Na][Li2][Mg2Fe23+Li]Si8O22(OH)2
9.DE.25Potassic-ferri-leakeite[K][Na2][Mg2Fe23+Li]Si8O22(OH)2
9.DE.25Fluoro-nybøiteNaNa2(Mg3Al2)(AlSi7O22)(F,OH)2
9.DE.25Mangani-dellaventuraite{Na}{Na2}{MgMn23+LiTi4+}Si8O22O2
9.DE.25Fluoro-pedriziteNaLi2(Mg2Al2Li)(Si8O22)F2
9.DE.25Potassic-arfvedsonite[(K,Na)][Na2][Fe42+Fe3+]Si8O22(OH)2
9.DE.25Mangani-obertiiteNa(Na2)(Mg3Mn3+Ti)(Si8O22)O2
9.DE.25Potassic-magnesio-fluoro-arfvedsonite[(K,Na)][Na2][Mg4Fe3+][Si8O22][(F,OH)2]
9.DE.25Ferro-ferri-pedrizite[Na][Li2][Fe22+Fe23+Li]Si8O22(OH)2
9.DE.25Potassic-magnesio-arfvedsonite[K][Na2][Mg4Fe3+]Si8O22(OH)2
9.DE.25PedriziteNaLi2(LiMg2Al2)(Si8O22)(OH)2
9.DE.25Ferro-pedriziteNaLi2(Fe22+Al2Li)Si8O22(OH)2
9.DE.25Fluoro-leakeiteNaNa2(Mg2Al2Li)(Si8O22)F2
9.DE.25Ferro-ferri-obertiiteNaNa2(Fe32+Fe3+Ti)Si8O22O2
16.21.1EsseneiteCaFe3+[AlSiO6]
16.21.2Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
16.21.4Ferro-aluminotschermakite☐{Ca2}{Fe32+Al2}(Al2Si6O22)(OH)2
16.21.5Ferri-tschermakite☐{Ca2}{Mg3Fe23+}(Al2Si6O22)(OH)2
16.21.6Ferro-Ferri-tschermakite☐{Ca2}{Fe32+Fe23+}(Al2Si6O22)(OH)2
16.21.7Alumino-ferro-hornblende☐{Ca2}{Fe42+Al}(AlSi7O22)(OH)2
16.21.8Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
16.21.8Pumpellyite-(Fe3+)Ca2(Fe3+,Mg,Fe2+)(Al,Fe3+)2(Si2O7)(SiO4)(OH,O)2 · H2O

Other Names for Ferro-tschermakite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ferro-tschermakite

Reference List:
Hawthorne, F.C. and Grundy, H.D. (1973a) The crystal chemistry of the amphiboles. I. Refinement of the crystal structure of ferrotschermakite. Mineralogical Magazine: 39: 36-48.

Mineralogical Record: 29: 169-174.

Hawthorne, Frank C., and Roberta Oberti (2006), On the classification of amphiboles: Canadian Mineralogist:
44(1): 1-21.

Ishida, K. and Hawthorne, F.C. (2006) Assignment of infrared OH-stretching bands in calcic amphiboles through deuteration and heat treatment. American Mineralogist: 91: 871-879.

Frank C. Hawthorne, Roberta Oberti, George E. Harlow, Walter V. Maresch, Robert F. Martin, John C. Schumacer, Mark D. Welch (2012): Nomenclature of the amphibole supergroup, American Mineralogist, Volume 97, pages 2031–2048

Internet Links for Ferro-tschermakite

Localities for Ferro-tschermakite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • New South Wales
    • Yancowinna Co.
Econ Geol (1985) 80:488-496
      • Broken Hill District
        • Northern Section
  • Victoria
    • City of Greater Shepparton
      • Dookie
G L Morvell (1976). Mineral Occurrences at Dookie, Victoria. Australian Mineralogist No.6 Oct/Nov 1976, pp. 21-23; G.L. Morvell (1976), Mineral Occurrences at Dookie, Victoria. Australian Mineralogist No.6 Oct/Nov 1976 pp. 21-23
Brazil
 
  • Goiás
Jost, H., and de Tarso Ferro de Oliveira Fortes, P. (2001): Mineralium Deposita 36, 358-376.
  • Pará
Revista Brasileirade Geociências 30(3):367-370 (2000)
  • Paraíba
    • Borborema mineral province
      • Catingueira
Souza Neto, J.A., Legrand, J.M., Volfinger, M., Pascal, M.-L., and Sonnet, P. (2008): Mineralium Deposita 43, 185-205.
Canada
 
  • Manitoba
    • Lynn Lake District
Samson I M, Blackburn W H, Gagnon J E (1999) Paragenesis and composition of amphibole and biotite in the MacLellan gold deposit, Lynn Lake greenstone belt, Manitoba, Canada, The Canadian Mineralogist 37, 1405-1421
  • Ontario
    • Sudbury District
      • Levack Township
McCormick, K.A. and McDonald, A. (1999) Chlorine-bearing amphiboles from the Fraser mine, Sudbury, Ontario, Canada: Description and crystal chemistry. Canadian Mineralogist, 37, 1385-1403.
    • Thunder Bay District
      • Bomby Township
        • Hemlo gold deposit
Econ Geol (1994) 89:720-756
    • Timiskaming District
      • Boston Township
Econ Geol (1993) 88:817-836
  • Québec
    • Nord-du-Québec
      • Chibougamau
Guha et al (1991) Geological Survey of Canada Open File Report 2158 pp97-103
China
 
  • Inner Mongolia Autonomous Region
    • Ulanhad League (Chifeng Prefecture)
      • Hexigten Banner (Keshiketeng Co.)
Yiming Zhao and Daxin Li (2003): Mineral Deposits 22(4), 345-359; Zhenhua Zhou, Hongwei Liu, Guoxiong Chang, Linsu Li, Tao Li, Yongjun Yang, Ruijun Zhang, and Xianhe Ji (2011): Acta Petrologica et Mineralogica 30(1), 97-112
  • Yunnan Province
    • Honghe Autonomous Prefecture
      • Gejiu Co.
Yiming Zhao and Daxin Li (2003): Mineral Deposits 22(4), 345-359
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • Olomouc Region
      • Javorník (Jauernig)
        • Horní Hostice
Zimák, J.: Mineralogie železných rud na historickém ložisku Horní Hoštice v Rychlebských horách (Česká republika). Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 2008, vol. 16, 2, 238-242.
Egypt
 
  • Red Sea Governorate
    • Eastern Desert
Mona Kabesh, Asran M. Asran and Ezzat Abdel Rahman (2012) Mineral chemistry of banded migmatites from Hafafit and Feiran areas, Egypt. Arabian Journal of Geosciences 1866-7511:1-13
Finland
 
  • Lapland Region
    • Enontekiö
Sipilä, Pekka 1992. The Caledonian Halt-Ridnitsohkka igneous complex in Lapland. Geological Survey of Finland Bulletin 362, 75 p. 23 app. pages
France
 
  • Midi-Pyrénées
    • Tarn
Eur. J. Mineral. , 1993, 5, pp. 879-891.
Germany
 
  • Bavaria
Christian Rewitzer (personal collection/dealer)
Namibia
 
  • Khomas Region
    • Windhoek District
      • Aris
www.excaliburmineral.com/mind-j.htm.
Poland
 
  • Lower Silesia (Dolnośląskie)
    • Strzegom-Sobótka Massif
      • Świdnica District
DHZ, Vol. 2B, 2nd ed., p. 249.
Slovakia
 
  • Banská Bystrica Region
    • Poltár Co.
      • Kalinovo
Spišak J., Hovorka D 2005.: Metabazity a metasedimenty z okolia ultrabázického telesa medzi Brezničkou a Kalinovom. Min.Slov., 37,1, 47-54
Sweden
 
  • Lappland
    • Kiruna district
Valentin Alain (2014) Mineral Chemistry and Texture Paragenesis of Alteration Minerals in the Pahtohavare Cu-Au Deposit, Sweden. Masters Thesis Luleå University of Technology
Switzerland
 
  • Wallis (Valais)
    • Goms
      • Ulrichen
        • Ägene Valley
          • Gries lake area
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 263.
USA
 
  • Colorado
    • Gunnison Co.
      • Ruby District
Caine, J.S., Manning, A.H., Berger, B.R., Kremer, Y., Guzman, M.A., Eberl, D.D., and Schuller, K. (2010): USGS Open-File Report 10-1008
  • New York
    • St. Lawrence Co.
  • Virginia
    • Pittsylvania Co.
      • James River-Roanoke River Mn-Fe-Ba District
ROBERT J. TRACY and JAMES S. BEARD(2003): Manganoan kinoshitalite in Mn-rich marble and skarn from Virginia American Mineralogist Vol 88:pp740-747
Mineral and/or Locality  
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