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Actinolite-Tremolite Series

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About Actinolite-Tremolite SeriesHide

Crystal System:
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.
Series Formula:
☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2 to ☐{Ca2}{Mg5}(Si8O22)(OH)2
A series between Actinolite and Tremolite

Tremolite is defined as having an Mg/(Mg+Fe2+) ratio ≥ 0.9; actinolite (retained for petrological reasons) has a ratio of 0.5–0.9 and ferro-actinolite has a ratio of less than 0.5 (Leake et al., 1997; Hawthorne et al., 2012).
See also Actinolite-Ferro-actinolite Series.

Notes on the formula of the series:
The actinolite-tremolite 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 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.

Crystallography of Actinolite-Tremolite SeriesHide

Crystal System:

Synonyms of Actinolite-Tremolite SeriesHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
8 photos of Actinolite-Tremolite Series associated with CalciteCaCO3
6 photos of Actinolite-Tremolite Series associated with Vigezzite(Ca,Ce)(Nb,Ta,Ti)2O6
6 photos of Actinolite-Tremolite Series associated with QuartzSiO2
6 photos of Actinolite-Tremolite Series associated with HessoniteCa3Al2(SiO4)3
4 photos of Actinolite-Tremolite Series associated with MagnetiteFe2+Fe3+2O4
2 photos of Actinolite-Tremolite Series associated with PyriteFeS2
1 photo of Actinolite-Tremolite Series associated with AlbiteNa(AlSi3O8)
1 photo of Actinolite-Tremolite Series associated with GrossularCa3Al2(SiO4)3
1 photo of Actinolite-Tremolite Series associated with Smoky QuartzSiO2
1 photo of Actinolite-Tremolite Series associated with DiopsideCaMgSi2O6

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.

References for Actinolite-Tremolite SeriesHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Leake, B.E., Woolley, A.R., Arps, C.E.S., Birch, W.D., Gilbert, M.C., Grice, J.D., Hawthorne, F.C., Kato, A., J.Kisch, H.J.., G. Krivovichev, V.G., Linthout, K., Laird, J., Mandarino, J.A., Maresch, W.V., Nickel, E.H., Rock, N.M.S., Schumacher, J.C., Smith, D.C., Stephenson, N.C.N., Ungaretti, L., Whittaker, E.J.W., Guo, Y. (1997) Nomenclature of amphiboles of the International Mineralogical Association, Commission on New Minerals and Mineral Names. American Mineralogist: 82: 1019-1037.
Hawthorne, F.C., Oberti, R., Harlow, G.E., Maresch, W.V., Martin, R.F., Schumacher, J.C., Welch, M.D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist: 97: 2031-2048.

Internet Links for Actinolite-Tremolite SeriesHide

Localities for Actinolite-Tremolite SeriesHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • South Australia
    • Mt Lofty Ranges
      • North Mt Lofty Ranges
        • Burra
Collection of Mark Willoughby
  • Carinthia
    • Völkermarkt District
      • Eisenkappel-Vellach
        • Ebriach
C.Auer (2017)
  • Ontario
    • Haliburton Co.
      • Cardiff Township
Anne P. Sabina (1986) Rocks and Minerals for the Collector, Bancroft-Parry Sound and South Eastern Ontario
      • Dudley Township
Van King
      • Lutterworth Township
Canadian Museum of Nature data
    • Hastings Co.
      • Monteagle Township
        • Musclow Greenview Road roadcuts
Andrew Debnam collection
  • Québec
    • Outaouais
      • Gatineau TE
        • Gatineau Park
Matt Courville collection
  • Valparaíso
    • Petorca Province
Maksaev, V., Townley, B., Palacios, C., and Camus, F. (2007): Metallic ore deposits. In: Moreno, T., and Gibbons, W. (editors): The Geology of Chile. The Geological Society (London), pp. 414.
  • Auvergne-Rhône-Alpes
    • Savoie
      • La Lauzière massif
DE ASCENCAO GUEDES R.. (2000). La Lauzière : les espèces minérales, Savoie, France. Le Règne Minéral hors-série n°6, pp. 24-39. Editions du Piat.
DE ASCENCAO GUEDES R.. (2000). La Lauzière : les espèces minérales, Savoie, France. Le Règne Minéral hors-série n°6, pp. 24-39. Editions du Piat.
  • Saxony-Anhalt
    • Harz
      • Thale
        • Friedrichsbrunn
Thomas Lühr
  • Tuscany
    • Livorno Province
      • Elba Island
        • Rio Marina
Pandeli, E., Principi, G., Bortolotti, V., Benvenuti, M., Fazzuoli, M., Dini, A., Fanucci, F., Menna, F., Nirta, G. (2013): The Elba Island: an intriguing geological puzzle in the Northern Tyrrhenian Sea. 85° Congresso Nazionale della Società Geologica Italiana, Pisa 6-8 settembre 2010. Geological Field Trips, Vol. 5, No. 2.1, 144 pp.
    • Lucca Province
      • Garfagnana
        • San Romano Garfagnana
Biagioni, C. (2009). Minerali della Provincia di Lucca. Associazione Micro-Mineralogica Italiana, Cremona, 352 pp.
    • Metropolitan City of Florence
      • Firenzuola
        • Futa Pass area
          • Monte Beni
Bardi, T., Becucci, A. & Biagioni, C. (2012): Monte Beni - I minerali dell'ex cava Fantoni (Pietramala, Firenzuola, Firenze). MICRO, 3/2012, 98-109.
  • Buskerud
    • Kongsberg
      • Overberget Mining Field
Nordrum, F.S.(1999): Nyfunn av mineraler i Norge 1998-1999. Norsk Bergverksmuseum Skrift 15: 87-90
Van der Wel, D. (1972): Contribution to the Mineralogy of Norway No. 51. Asbestos minerals from Kongsberg silver deposit. Norsk Geologisk Tidsskrift 52: 287-294
  • Örebro County
    • Hällefors
      • Uvberget
Wilke, H.-J. (1976): Mineral-Fundstellen Band 4: Skandinavien. Chr. Weise Verlag, München, 370 pp. (p. 197-198)
Wilke, H.-J. (1976): Mineral-Fundstellen Band 4: Skandinavien. Chr. Weise Verlag, München, 370 pp. (p. 197-198)
  • Värmland County
    • Filipstad
      • Persberg ore district
        • Pajsberg
Nysten, P. (1984): Kleinod des Nordens - Harstigen in Schweden. Magma 2/1984, 12-30.
  • Västmanland County
    • Skinnskatteberg
      • Riddarhyttan
        • Bastnäs Mines
Holtstam, D., Bindi, L., Hålenius, U., Andersson, U.B. (2017): Delhuyarite-(Ce) Ce4Mg(Fe3+2W)□(Si2O7)2O6(OH)2 a new mineral of the chevkinite group, from the Nya Bastnäs Fe–Cu–REE deposit, Sweden. European Journal of Mineralogy, 29, 897-905
  • Valais
    • Binn Valley
"Amir Akhavan" collection
  • England
    • Cornwall
      • Grade-Ruan
        • Kennack
          • Kennack Cove (Kennack Sands)
Alysson Rowan Collection
  • California
    • Santa Cruz Co.
      • Santa Cruz Mts
        • Ben Lomond Mountain
Leo, G.W. (1967) The plutonic and metamorphic rocks of the Ben Lomond Mountain area, Santa Cruz County, California. California Division of Mines and Geology Special Report 91: 41; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 399.
  • Massachusetts
    • Middlesex Co.
P. Cristofono collection
P. Cristofono collection
  • Oregon
    • Coos Co.
      • Bandon
Alt, D., and Hyndman, D., 1978, Roadside Geology of Oregon: Missoula, Mountain Press, p. 97-98.
  • Washington
    • King Co.
      • North Bend
        • Hansen Creek
T Douglas Schonewald Collection
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