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Tremolite-Actinolite Series

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About Tremolite-Actinolite SeriesHide

Formula:
☐{Ca2}{Z5}(Si8O22)(OH,F,Cl)2
The tremolite-actinolite series is defined as a minerals in the calcium amphibole subgroup with A(Na+K+2Ca)≤0,5 apfu and C(Al+Fe3+ +2Ti)≤0,5 apfu.

The individual minerals are defined based on the Fe2+/Mg ratio in the Z position (= IMA C position) and whether (OH),F or Cl is dominant.

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.
Name:
Tremolite are named by J.G.A. Höpfner for the Tremola valley (Val Tremola), Central St Gotthard Massif, Switzerland, where the type material supposedly came from, according to the dealer from whom he had acquired the specimens. However, modern investigations of what is considered the type material, conserved at Geneva, revealed that the true type locality is Campolungo. (Val Tremola lying north of the isograde delineating the first appearance of tremolite)

The name actinolite are derived from the Greek ακτίνα ("aktina") for "ray" and λίθος ("lithos") for "stone" in allusion to its fibrous nature.
This page provides mineralogical data about Tremolite-Actinolite Series.


Approval History:
Redefined by IMA: 2012

Chemical Properties of Tremolite-Actinolite SeriesHide

Formula:
☐{Ca2}{Z5}(Si8O22)(OH,F,Cl)2

The tremolite-actinolite series is defined as a minerals in the calcium amphibole subgroup with A(Na+K+2Ca)≤0,5 apfu and C(Al+Fe3+ +2Ti)≤0,5 apfu.

The individual minerals are defined based on the Fe2+/Mg ratio in the Z position (= IMA C position) and whether (OH),F or Cl is dominant.

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.

Synonyms of Tremolite-Actinolite SeriesHide

Relationship of Tremolite-Actinolite Series to other SpeciesHide

Other Members of this group:
Cannilloite Root NameCa(Ca2)(Z2+4Z3+))(Al3Si5O22)(OH,F,Cl)2
Edenite Root NameA(Ca2)Z5(AlSi7O22)((OH,F,Cl)2Mon.
Hastingsite Root Name(A)(Ca2){Z2+4 Fe3+)(Al2Si6O22)(OH,F,Cl)2
Hornblende Root Name☐(Ca2)(Z2+4Z3+}(AlSi7O22)(OH,F,Cl)2Mon.
Joesmithite{Pb}{Ca2}{Mg3Fe3+2}(Be2Si6O22)(OH)2Mon.
Pargasite Root Name(A)(Ca2){Z2+4 Al)(Al2Si6O22)(OH,F,Cl)2
Sadanagaite Root NameA (Ca2)(Z2+3Z3+2)(Si5Al3O22)(OH,F,Cl)2Mon.
Tschermakite Root Name☐(Ca2)(Z2+3Z3+2}(Al2Si6O22)(OH,F,Cl)2
Group Members:
Actinolite ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2Mon. 2/m : B2/m
Ferro-actinolite ☐{Ca2}{Fe2+5}(Si8O22)(OH)2Mon.
Ferro-fluoro-actinolite ☐{Ca2}{Fe5}(Si8O22)F2
Fluoro-tremolite ☐{Ca2}{Mg5}(Si8O22)F2Mon. 2/m : B2/m
Tremolite ☐{Ca2}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m

Other InformationHide

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

Tremolite-Actinolite Series in petrologyHide

References for Tremolite-Actinolite SeriesHide

Reference List:
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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 Tremolite-Actinolite SeriesHide

Mineral and/or Locality  
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