Tschermakite Root Name Group
A group of related mineral species
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About Tschermakite Root Name Group
Formula:
◻(Ca2)(Z2+3Z3+2}(Al2Si6O22)(OH,F,Cl)2
The tschermakite minerals are defined as amphiboles in the calcium amphibole subgroup with A(Na+K+2Ca)≤0.5 apfu and 1.5≤Z(Al + Fe3+ +2Ti) apfu. The individual minerals are defined by their dominant element in the A, Z2+ (= IMA C2+) and W position.
Z2+ position (= IMA C2+ position): Mg or Fe2+
Z3+ position (= IMA C3+): Al or Fe3+
W position: (OH) or F
In mindat.org we avoid using variables with the same symbol as elements and deviate from the IMA nomenclaure in that we use X rather than B, Z rather than C and (OH,F,Cl,O) rather than W.
Z2+ position (= IMA C2+ position): Mg or Fe2+
Z3+ position (= IMA C3+): Al or Fe3+
W position: (OH) or F
In mindat.org we avoid using variables with the same symbol as elements and deviate from the IMA nomenclaure in that we use X rather than B, Z rather than C and (OH,F,Cl,O) rather than W.
The tschermakite group was redefined in the 2012 amphibole nomenclature. The following changes are the most prominent:
1) Prior to 2012, tschermakite was defined with with Al ≈ Fe, it is now redefined to be the Al-dominant species in the group. As a consequence, all group members with a alumino- prefix are now discredited and all tschermakite and ferrotschermakite entries should be checked to see whether Al or Fe3+ are dominant.
3) The tschermakite group is in the 2012 nomenclature defined with C(Al+Fe3++2Ti)>1.5 apfu, whereas the pre-2012 definition was used the T position, i.e 5.5 < Si < 6.5 apfu. This redefinition does not change the formula, but some amphiboles qualifying as tschermakite group members pre-2012 may now belong to the magnesio-hornblende group.
NOTE: The tschermakite end-member composition is thermodynamically unstable, and most analyzed samples are close to one or more of the tschermakite/hastingsite/pargasite/sadanagaite joins. Any tschermakite specimen should therefore be analysed with qualitative chamical analysis (EMPA minimum, ideally in combination with Mössbauer spectroscopy to determine valence state(s) of Fe).
1) Prior to 2012, tschermakite was defined with with Al ≈ Fe, it is now redefined to be the Al-dominant species in the group. As a consequence, all group members with a alumino- prefix are now discredited and all tschermakite and ferrotschermakite entries should be checked to see whether Al or Fe3+ are dominant.
3) The tschermakite group is in the 2012 nomenclature defined with C(Al+Fe3++2Ti)>1.5 apfu, whereas the pre-2012 definition was used the T position, i.e 5.5 < Si < 6.5 apfu. This redefinition does not change the formula, but some amphiboles qualifying as tschermakite group members pre-2012 may now belong to the magnesio-hornblende group.
NOTE: The tschermakite end-member composition is thermodynamically unstable, and most analyzed samples are close to one or more of the tschermakite/hastingsite/pargasite/sadanagaite joins. Any tschermakite specimen should therefore be analysed with qualitative chamical analysis (EMPA minimum, ideally in combination with Mössbauer spectroscopy to determine valence state(s) of Fe).
Unique Identifiers
Mindat ID:
43418
Long-form identifier:
mindat:1:1:43418:8
GUID
(UUID V4):
(UUID V4):
f55a0b1f-67cf-41ed-a226-618d37d2d414
Chemistry of Tschermakite Root Name Group
Mindat Formula:
◻(Ca2)(Z2+3Z3+2}(Al2Si6O22)(OH,F,Cl)2
The tschermakite minerals are defined as amphiboles in the calcium amphibole subgroup with A(Na+K+2Ca)≤0.5 apfu and 1.5≤Z(Al + Fe3+ +2Ti) apfu. The individual minerals are defined by their dominant element in the A, Z2+ (= IMA C2+) and W position.
Z2+ position (= IMA C2+ position): Mg or Fe2+
Z3+ position (= IMA C3+): Al or Fe3+
W position: (OH) or F
In mindat.org we avoid using variables with the same symbol as elements and deviate from the IMA nomenclaure in that we use X rather than B, Z rather than C and (OH,F,Cl,O) rather than W.
The tschermakite minerals are defined as amphiboles in the calcium amphibole subgroup with A(Na+K+2Ca)≤0.5 apfu and 1.5≤Z(Al + Fe3+ +2Ti) apfu. The individual minerals are defined by their dominant element in the A, Z2+ (= IMA C2+) and W position.
Z2+ position (= IMA C2+ position): Mg or Fe2+
Z3+ position (= IMA C3+): Al or Fe3+
W position: (OH) or F
In mindat.org we avoid using variables with the same symbol as elements and deviate from the IMA nomenclaure in that we use X rather than B, Z rather than C and (OH,F,Cl,O) rather than W.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0006297 | Tschermakite | Abdu Y A, Hawthorne F C (2009) Crystal structure and Mossbauer spectroscopy of tschermakite from the ruby locality at Fiskenaesset, Greenland The Canadian Mineralogist 47 917-926 |  | 2009 | Fiskenaesset, Greenland | 0 | 293 |
CIF Raw Data - click here to close
Relationship of Tschermakite Root Name Group to other Species
Other Members of this group:
| Actinolite Root Name Group | ◻Ca2(Mg0-4.5M2+0.5-5)Si8O22(OH,F,Cl)2 | |
| Cannilloite Root Name Group | CaCa2(Z2+4Z3+)(Si5Al3O22)(OH,F,Cl)2 | |
| Edenite Root Name Group | ACa2Z5(AlSi7O22)((OH),F,Cl)2 | Mon. |
| Hastingsite Root Name Group | ACa2(Z2+4Fe3+)(Al2Si6O22)(OH,F,Cl)2 | |
| Hornblende Root Name Group | ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2 | Mon. |
| Joesmithite | Pb2+Ca2(Mg3Fe3+2)(Si6Be2)O22(OH)2 | Mon. 2/m : P2/b |
| Pargasite Root Name Group | (A)(Ca2){Z2+4Z3+)(Al2Si6O22)(OH,F,Cl)2 | |
| Sadanagaite Root Name Group | A (Ca2)(Z2+3Z3+2)(Si5Al3O22)(OH,F,Cl)2 | Mon. |
| Tremolite Root Name Group | ◻Ca2(Mg4.5-5M2+0-0.5)Si8O22W2 |
Group Members:
| Ferri-tschermakite | ◻{Ca2}{Mg3Fe3+2}(Al2Si6O22)(OH)2 | Mon. |
| Ferro-tschermakite | ◻{Ca2}{Fe2+3Al2}(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
| Tschermakite | ◻(Ca2)(Mg3Al2)(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
Minerals chemically related to group:
| Hastingsite Root Name Group | ACa2(Z2+4Fe3+)(Al2Si6O22)(OH,F,Cl)2 | |
| Hornblende Root Name Group | ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2 | |
| Pargasite Root Name Group | (A)(Ca2){Z2+4Z3+)(Al2Si6O22)(OH,F,Cl)2 |
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.
Internet Links for Tschermakite Root Name Group
mindat.org URL:
https://www.mindat.org/min-43418.html
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References for Tschermakite Root Name Group
Localities for Tschermakite Root Name Group
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Argentina | |
| [Ferri-tschermakite] Mineralogy and Petrology (2000) |
Australia | |
| [Tschermakite] Sutherland et al. (2003) |
| [Ferro-tschermakite] |
| [Ferro-tschermakite] Gulson et al. (1985) | |
| [Ferri-tschermakite] R Bottrill (in prep) |
| [Ferro-tschermakite] G L Morvell (1976) +1 other reference |
| [Tschermakite] Geological Society of Australia WA Div. |
| [Ferro-tschermakite] Steadman et al. (2014) | |
| [Ferro-tschermakite] Steadman et al. (2014) |
| [Tschermakite] Roche (2016) |
Bangladesh | |
| [Tschermakite] Rahman et al. (2022) |
Brazil | |
| [Ferro-tschermakite] [[1]]Santos et al. (2020) |
| [Tschermakite] Mesquita et al. (2017) |
| [Ferro-tschermakite] Jost et al. (2001) |
| [Tschermakite] Campos et al. (2022) |
| [Tschermakite] Jour. of South American Earth Sci. ... |
| [Ferro-tschermakite] Revista Brasileirade Geociências 30 (3) |
| [Ferro-tschermakite] Souza Neto et al. (2008) |
| [Tschermakite] Massuda et al. (2020) |
Canada | |
| [Ferro-tschermakite] Samson I M et al. (1999) |
| [Tschermakite] Pe-Piper et al. (2024) |
| [Tschermakite] www.venuewest.com/8IKC/s1post.htm. |
| [Ferro-tschermakite] Szentpeteri et al. (2003) |
| [Ferro-tschermakite] McCormick et al. (1999) |
| [Tschermakite] Charles A. Tarnocai et al. (1997) +1 other reference |
| [Ferro-tschermakite] Kuhns et al. (1994) |
| [Ferro-tschermakite] Econ Geol (1993) |
| [Ferro-tschermakite] Guha et al (1991) |
China | |
| [Tschermakite] Franz et al. (2001) |
| [Tschermakite] C. Lemanski (re-entry of lost Mindat data) |
| [Tschermakite] Tian et al. (2023) |
| [Tschermakite] Porter (2016) |
| [Tschermakite] Zheng et al. (2015) |
| [Tschermakite] Dongyang Zhang et al. (2010) |
| [Ferro-tschermakite] Li et al. (2022) |
| [Ferro-tschermakite] Yiming Zhao and Daxin Li (2003) +1 other reference |
| Huiwen Liu et al. (2014) |
| [Tschermakite] Bai et al. (2018) |
| [Tschermakite] Weidong Hui et al. (2011) |
| [Tschermakite] Wang et al. (2022) |
| [Ferro-tschermakite] Yiming Zhao and Daxin Li (2003) |
Czech Republic | |
| [Ferro-tschermakite] Zimák (Česká republika) |
| [Tschermakite] Mücke et al. (2002) |
| [Tschermakite] Mücke et al. (2002) |
| [Tschermakite] Mücke et al. (2002) | |
| [Tschermakite] Mücke et al. (2002) | |
| [Tschermakite] Mücke et al. (2002) | |
| [Tschermakite] Zimák et al. (2018) | |
| [Tschermakite] Cílek et al. (západočeské svrchní proterozoikum) |
| [Ferri-tschermakite] Vrána (2011) |
| [Ferro-tschermakite] Dolníček Z et al. (2020) |
Egypt | |
| [Ferro-tschermakite] Mona Kabesh (2012) |
Finland | |
| [Ferro-tschermakite] Sipilä |
| [Tschermakite] Papunen |
| [Tschermakite] Laitakari (1916) |
France | |
| [Tschermakite] F. André and J. Béhien |
| [Ferro-tschermakite] Mineralogical Magazine: 81: 737–742 +1 other reference |
| [Tschermakite] T. Sameshima et al. |
| [Tschermakite] Bull. Soc. Franç. Minéralo. ... |
| [Tschermakite] Arliguie M collection |
| [Ferro-tschermakite] Eur. J. Mineral. |
Germany | |
| [Ferro-tschermakite] Christian Rewitzer (personal collection/dealer) |
| [Tschermakite] Weiß (1990) |
| [Ferri-tschermakite] in the collection of Christof Schäfer |
| [Ferri-tschermakite] Marco E. Ciriotti new data |
Greece | |
| [Tschermakite] Eur. J. Mineral. |
Greenland | |
| [Tschermakite] Petersen et al. (1993) |
Hungary | |
| [Tschermakite] Harangi |
| [Tschermakite] Szakáll-Gatter-Szendrei |
| [Tschermakite] Mineral Species of Hungary |
| [Tschermakite] Szakáll-Gatter-Szendrei |
India | |
| [Tschermakite] Narayanan Kutty et al. (1977) |
| [Tschermakite] Chowdhury (2007) +1 other reference |
| [Tschermakite] Rout et al. (2022) |
Indonesia | |
| [Tschermakite] Knuever et al. (2023) | |
Iran | |
| [Tschermakite] Kamali et al. (2018) +1 other reference |
Italy | |
| [Tschermakite] Russo et al. (2004) |
| [Tschermakite] Knuever et al. (2023) |
| [Tschermakite] Gamboni et al. (2006) |
Madagascar | |
| [Tschermakite] Frank K. Mazdab collection |
| [Tschermakite] Andrianjakavah et al. +1 other reference |
Mexico | |
| [Tschermakite] American Mineralogist |
Namibia | |
| [Ferro-tschermakite] www.excaliburmineral.com/mind-j.htm. |
New Zealand | |
| [Tschermakite] Mossman et al. (2000) |
| [Tschermakite] Mossman et al. (2000) | |
Norway | |
| [Tschermakite] Brickwood (1986) |
| [Tschermakite] Birkeland et al. (1993) |
| [Tschermakite] Smith (1988) |
Oman | |
| [Tschermakite] The Meteoritical Bulletin et al. (2004) |
Pakistan | |
| [Tschermakite] Rolfo et al. (1997) |
| [Tschermakite] imported from Rondu District +1 other reference | |
| [Tschermakite] DH&Z +1 other reference |
Philippines | |
| [Tschermakite] Cao et al. (2018) |
Poland | |
| [Ferro-tschermakite] Gil et al. (2022) |
| [Tschermakite] Oberc-Dziedzic et al. (2011) |
| [Ferro-tschermakite] DHZ |
Romania | |
| [Tschermakite] Delia Cristina Papp et al. (2005) |
Russia | |
| [Tschermakite] Kiseleva et al. (2022) |
| [Tschermakite] Sorokina et al. (2019) |
| [Tschermakite] Barkov et al. (2019) |
| [Tschermakite] Novakov et al. (2021) |
| [Tschermakite] Tararin et al. (2007) | |
| [Tschermakite] Tararin et al. (2007) | |
| [Ferro-tschermakite] Bazai et al. (2009) |
| [Tschermakite] Nikolay Serebryakov data |
| [Tschermakite] A. Yu. Barkov et al. |
| [Tschermakite] Pavel.M. Kartashov (n.d.) |
| [Ferro-tschermakite] Ivashchenko et al. (2018, June) |
| [Tschermakite] Trunilina et al. (2024) |
Slovakia | |
| [Tschermakite] [[1]]Reato |
| [Ferro-tschermakite] Spišak J. |
| [Tschermakite] Ozdín D. |
| [Ferro-tschermakite] Myšľan et al. (2021) |
| [Tschermakite] Spišák |
| [Tschermakite] Ďuďa |
South Korea | |
| [Tschermakite] Lee et al. (2022) |
Spain | |
| [Tschermakite] Majarena Serrano (2015) |
| [Tschermakite] Martin-Izard et al. (1995) |
Sweden | |
| [Ferro-tschermakite] Valentin Alain (2014) |
Switzerland | |
| [Tschermakite] Stalder et al. (1998) |
| [Tschermakite] Stalder et al. (1998) |
| [Ferro-tschermakite] Stalder et al. (1998) |
Tanzania | |
| [Tschermakite] Cedric Simonet (2000) |
UK | |
| [Tschermakite] Tindle (2008) | |
| [Tschermakite] Ferry (1996) |
| [Tschermakite] Smellie et al. (1984) |
| [Tschermakite] www.minsocam.org | |
| [Tschermakite] Bevins et al. (1993) |
USA | |
| [Tschermakite] Geological Society of America Bulletin |
| [Tschermakite] Anthony et al. (1995) |
| [Tschermakite] Mertzman (1978) +1 other reference |
| [Ferro-tschermakite] Caine et al. (2010) |
| [Tschermakite] American Mineralogist |
| [Tschermakite] American Mineralogist |
| [Ferro-tschermakite] Mineralogical Society of America - ... |
| [Tschermakite] Stapor |
| [Tschermakite] Stapor | |
| [Tschermakite] Lang |
| [Tschermakite] McSween et al. (1984) |
| [Tschermakite] Anderson et al. (2009) |
| [Tschermakite] Nathan Clay Collins (2011) |
| [Tschermakite] Nathan Clay Collins (2011) |
| [Tschermakite] EL-Shazley et al. (2011) |
| [Tschermakite] Collins (2011) | |
| [Tschermakite] McSween Jr et al. (1984) |
| [Tschermakite] Page et al. (2004) |
| [Tschermakite] Page et al. (2004) | |
| [Tschermakite] McSween et al. (1984) |
| [Tschermakite] Stapor | |
| [Tschermakite] in the collection of Jennifer Cindrich |
| [Ferro-tschermakite] Tracy et al. (2003) +1 other reference |
| [Ferri-tschermakite] Thompson et al. (2015) +1 other reference |
Vietnam | |
| [Tschermakite] Xu et al. (2024) |
Zimbabwe | |
| [Tschermakite] Chaumba (2017) |
The Moon | |
Las Tapias Mine, Las Tapias, Rosas District, San Javier Department, Córdoba Province, Argentina