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Actinolite

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About ActinoliteHide

Formula:
◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22OH2
Colour:
Green, green-black, grey-green, or black
Lustre:
Vitreous, Silky
Hardness:
5 - 6
Specific Gravity:
3.03 - 3.24
Crystal System:
Monoclinic
Name:
Named in 1794 by Richard Kirwan from the Greek ακτίνα ("aktina") for "ray" and λίθος ("lithos") for "stone" in allusion to the fibrous nature of the original specimens.
Type locality not known.
Actinolite-Tremolite Series.
Note: Tremolite is defined as having an Mg/(Mg+Fe2+) ratio ≥ 0.9; actinolite has a ratio of 0.5–0.9 and ferro-actinolite has a ratio of less than 0.5. The name actinolite was retained for petrological reasons in the nomenclature (Leake et al., 1997; Hawthorne et al. 2012), since it is entrenched in the literature.

As bladed crystals, to 15 cm; columnar, may be kinked or bent; radiating fibrous to asbestiform; granular to massive.

Visit gemdat.org for gemological information about Actinolite.


Classification of ActinoliteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA status notes:
Redefined by the IMA
First published:
1794
Approval history:
Redefined by IMA in 2012 (special procedure).
9.DE.10

9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
14.23.2

14 : Silicates not Containing Aluminum
23 : Silicates of Fe, Mg, Ca

Pronounciation of ActinoliteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of ActinoliteHide

Vitreous, Silky
Transparency:
Transparent, Translucent
Colour:
Green, green-black, grey-green, or black
Comment:
Colourless, pale green to deep green in thin section.
Streak:
White
Hardness:
5 - 6 on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Distinct/Good
on {110}
Parting:
on {100}
Fracture:
Splintery
Density:
3.03 - 3.24 g/cm3 (Measured)    3.07 g/cm3 (Calculated)

Optical Data of ActinoliteHide

Type:
Biaxial (-)
RI values:
nα = 1.613 - 1.646 nβ = 1.624 - 1.656 nγ = 1.636 - 1.666
2V:
Measured: 79° to 86°, Calculated: 78° to 82°
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v
Pleochroism:
Weak
Comments:
X= pale yellow, yellowish green
Y= pale yellow-gree, green
Z= pale green, deep greenish blue

Chemical Properties of ActinoliteHide

Formula:
◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22OH2
IMA Formula:
◻Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2
Common Impurities:
Mn,Al,Na,K,Ti

Age distributionHide

Recorded ages:
Paleoproterozoic : 2260 ± 42 Ma to 1835 Ma - based on 5 recorded ages.

Crystallography of ActinoliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 9.891 Å, b = 18.2 Å, c = 5.31 Å
β = 104.64°
Ratio:
a:b:c = 0.543 : 1 : 0.292
Unit Cell V:
924.85 ų (Calculated from Unit Cell)
Z:
2
Twinning:
simple or lamellar, common parallel {100}; lamellar, less common parallel {001}

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0001981ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature American Mineralogist 83 458-47519980293
0001982ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature after heating at 700 C American Mineralogist 83 458-47519980293
0001983ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature American Mineralogist 83 458-47519980293
0001984ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature after heating at 700 C American Mineralogist 83 458-47519980293
0001985ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature American Mineralogist 83 458-47519980293
0001986ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature after heating at 700 C American Mineralogist 83 458-47519980293
0001987ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature American Mineralogist 83 458-47519980293
0001988ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature after heating at 700 C American Mineralogist 83 458-47519980293
0001989ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature American Mineralogist 83 458-47519980293
0001990ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature after heating at 600 C American Mineralogist 83 458-47519980293
0001991ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature after heating at 700 C American Mineralogist 83 458-47519980293
0001992ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature after heating at 800 C American Mineralogist 83 458-47519980293
0001993ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature American Mineralogist 83 458-47519980293
0001994ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature after heating at 700 C American Mineralogist 83 458-47519980293
0001995ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature American Mineralogist 83 458-47519980293
0001996ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature after heating at 700 C American Mineralogist 83 458-47519980293
0001997ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature American Mineralogist 83 458-47519980293
0001998ActinoliteEvans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature after heating at 700 C American Mineralogist 83 458-47519980293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
8.47 Å(70)
5.305 Å(10)
4.91 Å(70)
3.401 Å(80)
3.143 Å(70)
2.719 Å(100)
2.543 Å(100)
Comments:
ICDD 25-0157

Geological EnvironmentHide

Geological Setting:
Produced by low-grade regional or contact metamorphism of magnesium carbonate, mafic, or ultramafic rocks; Also in glaucophane-bearing blueschists.

Occurs in many localities. In Austria, on Mt. Greiner, Zillertal, and at Untersulzbachtal. From Zermatt, Valais, Switzerland. At Snarum and Arendal, Norway. From the Ural Mountains, Russia. In the USA, from Gouverneur, St. Lawrence Co., New York; Franklin and Newton, Sussex Co., New Jersey; Chester, Windsor Co., Vermont; in the Fairfax quarry, Centreville, Fairfax Co., Virginia; Crestmore, Riverside Co., California; at Salida, Chaffee Co., Colorado. Nephrite jade occurs, in the USA, south and east of Lander, Fremont Co., Wyoming; north from Cape San Martin, Monterey Co., California; and around Jade Mountain, near the Kobuk River, Alaska. Along the Fraser River, British Columbia, Canada. Around Mt. Cook, South Island, New Zealand. Fine material from the Kunlun Mountains, Sinkiang Uighur Autonomous Region, China.

Synonyms of ActinoliteHide

Other Language Names for ActinoliteHide

Varieties of ActinoliteHide

SmaragditeAn emerald green variety of actinolite, owing its colour to a faint chromium content.

Relationship of Actinolite to other SpeciesHide

Other Members of this group:
Cannilloite Root Name GroupCaCa2(Z2+4Z3+)(Si5Al3O22)(OH,F,Cl)2
Edenite Root Name GroupACa2Z5(AlSi7O22)((OH),F,Cl)2Mon.
Ferro-actinolite◻Ca2Fe2+5(Si8O22)OH2Mon.
Hastingsite Root Name GroupACa2(Z2+4 Fe3+)(Al2Si6O22)(OH,F,Cl)2
Hornblende Root Name Group◻(Ca2)(Z2+4Z3+}(AlSi7O22)(OH,F,Cl)2Mon.
JoesmithitePb2+Ca2(Mg3Fe3+2)(Si6Be2)O22(OH)2Mon.
Mangano-actinolite◻Ca2(Mg,Mn,Fe)5(Si8O22)(OH)2
Pargasite Root Name Group(A)(Ca2){Z2+4Z3+)(Al2Si6O22)(OH,F,Cl)2
Sadanagaite Root Name GroupA (Ca2)(Z2+3Z3+2)(Si5Al3O22)(OH,F,Cl)2Mon.
Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m
Tschermakite Root Name Group◻(Ca2)(Z2+3Z3+2}(Al2Si6O22)(OH,F,Cl)2
Forms a series with:

Common AssociatesHide

AlbiteNa(AlSi3O8)
Chlorite GroupA group of mostly monoclinic (also triclinic or orthorhombic) micaceous phyllosilicate minerals with a structure ...
Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Glaucophane◻[Na2][Mg3Al2]Si8O22(OH)2
LawsoniteCaAl2(Si2O7)(OH)2 · H2O
PumpellyiteSynonymous with members of the Pumpellyite Group (which includes also 'julgoldite').
TalcMg3Si4O10(OH)2
Associated Minerals Based on Photo Data:
164 photos of Actinolite associated with QuartzSiO2
132 photos of Actinolite associated with CalciteCaCO3
96 photos of Actinolite associated with Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
46 photos of Actinolite associated with TitaniteCaTi(SiO4)O
38 photos of Actinolite associated with MagnetiteFe2+Fe3+2O4
38 photos of Actinolite associated with TalcMg3Si4O10(OH)2
38 photos of Actinolite associated with Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
37 photos of Actinolite associated with Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
37 photos of Actinolite associated with PrehniteCa2Al2Si3O10(OH)2
36 photos of Actinolite associated with DyscrasiteAg3Sb

Related Minerals - Nickel-Strunz GroupingHide

9.DE.Clino-suenoite◻{Mn2+2}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.05Cummingtonite◻{Mg2}{Mg5}(Si8O22)(OH)2Mon.
9.DE.05Clino-holmquistite Root Name Group◻{Li2}{Z2+3Z3+2}(Si8O22)(OH,F,Cl)2Mon.
9.DE.05Grunerite◻{Fe2+2}{Fe2+5}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.05Permanganogrunerite◻{Mn2+2}{Mn2+5}(Si8O22)(OH)2Mon.
9.DE.05Ferri-fluoro-leakeite{Na}{Na2}{Mg2Fe3+2Li}(Si8O22)F2Mon. 2/m : B2/m
9.DE.10Ferri-tschermakite◻{Ca2}{Mg3Fe3+2}(Al2Si6O22)(OH)2Mon.
9.DE.10Ferro-actinolite◻Ca2Fe2+5(Si8O22)OH2Mon.
9.DE.10Ferro-hornblende◻Ca2(Fe2+4Al)(Si7Al)O22(OH)2Mon.
9.DE.10Ferro-tschermakite◻{Ca2}{Fe2+3Al2}(Al2Si6O22)(OH)2Mon. 2/m : B2/m
9.DE.10JoesmithitePb2+Ca2(Mg3Fe3+2)(Si6Be2)O22(OH)2Mon.
9.DE.10Magnesio-hornblende◻Ca2(Mg4Al)(Si7Al)O22(OH)2Mon. 2/m : B2/m
9.DE.10Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.10Tschermakite◻(Ca2)(Mg3Al2)(Al2Si6O22)(OH)2Mon. 2/m : B2/m
9.DE.10CannilloiteCaCa2(Mg4Al)(Si5Al3O22)OH2Mon.
9.DE.10Fluoro-cannilloiteCaCa2(Mg4Al)(Si5Al3)O22F2Mon.
9.DE.10Parvo-manganotremolite◻{CaMn2+}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.10Fluoro-tremolite◻{Ca2}{Mg5}(Si8O22)F2Mon. 2/m : B2/m
9.DE.10Ferro-ferri-hornblende◻Ca2(Fe2+4Fe3+)(AlSi7O22)(OH)2Mon. 2/m : B2/m
9.DE.15EdeniteNaCa2Mg5(Si7Al)O22OH2Mon.
9.DE.15Ferro-edeniteNaCa2Fe2+5(Si7Al)O22OH2Mon.
9.DE.15Ferro-kaersutiteNaCa2{Fe2+3AlTi}(Si6Al2O22)O2Mon.
9.DE.15Ferro-pargasiteNaCa2(Fe2+4Al)(Si6Al2)O22(OH)2Mon.
9.DE.15HastingsiteNaCa2(Fe2+4Fe3+)(Si6Al2)O22OH2Mon.
9.DE.15KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2Mon.
9.DE.15Magnesio-hastingsiteNaCa2(Mg4Fe3+)(Si6Al2)O22(OH)2Mon.
9.DE.15PargasiteNaCa2(Mg4Al)(Si6Al2)O22(OH)2Mon. 2/m : B2/m
9.DE.15Sadanagaite{Na}{Ca2}{Mg3Al2}(Si5Al3O22)(OH)2Mon.
9.DE.15Fluoro-edeniteNaCa2Mg5(Si7Al)O22F2Mon. 2/m : P2/m
9.DE.15Potassic-ferro-ferri-sadanagaite{K}{Ca2}{Fe2+3Fe3+2}(Al3Si5O22)(OH)2Mon.
9.DE.15Potassic-sadanagaite{K}{Ca2}{Mg3Al2}(Al3Si5O22)(OH)2Mon.
9.DE.15Potassic-pargasiteKCa2(Mg4Al)(Si6Al2)O22(OH)2Mon.
9.DE.15Potassic-ferro-sadanagaite{K}{Ca2}{Fe2+3Al2}(Al3Si5O22)(OH)2Mon.
9.DE.15Magnesio-fluoro-hastingsiteNaCa2(Mg4Fe3+)(Si6Al2)O22F2Mon. 2/m : B2/m
9.DE.15Potassic-fluoro-hastingsiteKCa2(Fe2+4Fe3+)(Si6Al2)O22F2Mon. 2/m : B2/m
9.DE.15Potassic-chloro-hastingsiteKCa2(Fe2+4Fe3+)(Si6Al2)O22Cl2Mon. 2/m : B2/m
9.DE.15Fluoro-pargasiteNaCa2(Mg4Al)(Si6Al2)O22F2Mon. 2/m : B2/m
9.DE.15Parvo-mangano-edenite{Na}{CaMn2+}{Mg5}(AlSi7O22)(OH)2Mon. 2/m : B2/m
9.DE.15Potassic-chloro-pargasiteKCa2(Mg4Al)(Si6Al2)O22Cl2Mon. 2/m : B2/m
9.DE.15Potassic-ferro-chloro-edeniteKCa2Fe2+5(AlSi7O22)Cl2
9.DE.15Potassic-magnesio-hastingsiteKCa2(Mg4Fe3+)(Si6Al2)O22(OH)2Mon. 2/m : B2/m
9.DE.15Potassic-ferro-pargasiteKCa2(Fe2+4Al)(Si6Al2)O22(OH)2Mon. 2/m : B2/m
9.DE.15Chromio-pargasite{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2Mon. 2/m : B2/m
9.DE.15Potassic-fluoro-pargasiteKCa2(Mg4Al)(Si6Al2)O22F2Mon. 2/m : B2/m
9.DE.15Ferri-kaersutiteNaCa2(Mg3Fe3+Ti)(Si6Al2O22)O2Mon. 2/m : B2/m
9.DE.15Vanadio-pargasiteNaCa2(Mg3+4V)(Al2Si6)O22(OH)2Mon. 2/m : B2/m
9.DE.20Ferro-taramiteNa(CaNa)(Fe2+3Al2)(Al2Si6O22)(OH)2Mon. 2/m : B2/m
9.DE.20Barroisite◻{CaNa}{Mg3Al2}(AlSi7O22)(OH)2Mon.
9.DE.20Ferro-ferri-barroisite◻(CaNa)(Fe2+3Fe3+2)(AlSi7O22)(OH)2
9.DE.20Ferro-ferri-winchite◻[CaNa][Fe2+4(Fe3+,Al)]Si8O22(OH)2
9.DE.20Ferri-barroisite◻(CaNa)(Mg3Fe3+2)(AlSi7O22)(OH)2
9.DE.20Ferro-ferri-taramiteNa(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)(OH)2
9.DE.20Ferro-ferri-katophoriteNa(NaCa)(Fe2+4Fe3+)(Si7Al)O22(OH)2Mon. 2/m : B2/m
9.DE.20Ferro-barroisite◻{CaNa}{Fe2+3Al2}(AlSi7O22)(OH)2Mon. 2/m : B2/m
9.DE.20Ferro-richterite{Na}{CaNa}{Fe2+5}(Si8O22)(OH)2Mon.
9.DE.20Ferro-winchite ◻{CaNa}{Fe2+4Al}(Si8O22)(OH)2Mon.
9.DE.20Ferro-katophorite{Na}{CaNa}{Fe2+4Al}[(AlSi7)O22](OH)2Mon. 2/m : B2/m
9.DE.20Ferri-katophoriteNa(CaNa)(Mg4Fe3+)(AlSi7O22)(OH)2Mon.
9.DE.20Ferri-taramiteNa(CaNa)(Mg3Fe3+2)(Al2Si6O22)(OH)2Mon.
9.DE.20Magnesiotaramite{Na}{CaNa}{Mg3AlFe3+}(Al2Si6O22)(OH)2Mon.
9.DE.20Richterite{Na}{NaCa}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.20Winchite◻{CaNa}{Mg4Al}(Si8O22)(OH)2Mon. 2/m
9.DE.20Taramite{Na}{CaNa}{Mg3Al2}(Al2Si6O22)(OH)2Mon. 2/m : B2/m
9.DE.20Fluoro-richterite{Na}{CaNa}{Mg5}(Si8O22)(F,OH)2Mon. 2/m
9.DE.20Katophorite{Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2Mon. 2/m : B2/m
9.DE.20Potassic-fluoro-richterite{K}{CaNa}{Mg5}(Si8O22)(F,OH)2Mon.
9.DE.20Potassic-richterite{K}{CaNa}{Mg5}Si8O22(OH)2Mon. 2/m : B2/m
9.DE.20Ferri-ghoseite◻[Mn2+Na][Mg4Fe3+]Si8O22(OH)2Mon. 2/m
9.DE.20Ferri-winchite◻(NaCa)(Mg4Fe3+)Si8O22(OH)2Mon. 2/m : B2/m
9.DE.20Fluoro-taramite{Na}{CaNa}{Mg3Al2}(Al2Si6O22)F2Mon. 2/m : B2/m
9.DE.20Fluoro-katophoriteNa(CaNa)(Mg4Al)(AlSi7O22)F2Mon.
9.DE.20Ferri-fluoro-katophoriteNa(CaNa)(Mg4Fe3+)(AlSi7O22)F2Mon. 2/m : B2/m
9.DE.25Arfvedsonite[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25EckermanniteNaNa2(Mg4Al}Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25Ferro-eckermanniteNaNa2(Fe2+4Al)Si8O22(OH)2Mon.
9.DE.25Ferro-glaucophane◻[Na2][Fe2+3Al2]Si8O22(OH)2Mon.
9.DE.25Glaucophane◻[Na2][Mg3Al2]Si8O22(OH)2Mon.
9.DE.25Potassic-mangani-leakeite[(Na,K)][Na2][Mg2Mn3+2Li]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25Mangano-ferri-eckermannite{Na}{Na2}{Mn2+4Fe3+}Si8O22(OH)2Mon.
9.DE.25Ferri-leakeite[Na][Na2][Mg2Fe3+2Li]Si8O22(OH)2Mon.
9.DE.25Magnesio-riebeckite◻{Na2}{Mg3Fe3+2}(Si8O22)(OH)2Mon.
9.DE.25Magnesio-arfvedsonite{Na}{Na2}{Mg4Fe3+}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.25NybøiteNaNa2(Mg3Al2)(AlSi7O22)(OH)2Mon. 2/m : B2/m
9.DE.25Riebeckite◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25Mangano-mangani-ungarettiiteNaNa2(Mn2+2Mn3+3)(Si8O22)O2Mon.
9.DE.25Ferro-ferri-nybøiteNaNa2[(Fe2+3,Mg)Fe3+2](AlSi7O22)(OH)2Mon. 2/m : B2/m
9.DE.25Clino-ferro-ferri-holmquistite◻{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.25Ferri-nybøiteNaNa2(Mg3Fe3+2](AlSi7O22)(OH)2Mon.
9.DE.25Ferro-ferri-leakeite[Na][Na2][Fe2+2Fe3+2Li]Si8O22(OH)2Mon.
9.DE.25Ferro-ferri-fluoro-leakeiteNa(Na2)(Fe2+2Fe3+2Li)(Si8O22)(F)2Mon.
9.DE.25Sodic-ferri-clinoferroholmquistiteNa0.5{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2Mon.
9.DE.25Magnesio-fluoro-arfvedsonite[Na][Na2][Mg4Fe3+][Si8O22](F,OH)2Mon.
9.DE.25Ferri-pedrizite[Na][Li2][Mg2Fe3+2Li]Si8O22(OH)2Mon.
9.DE.25Potassic-ferri-leakeite[K][Na2][Mg2Fe3+2Li]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25Fluoro-nybøiteNaNa2(Mg3Al2)(AlSi7O22)(F,OH)2Mon. 2/m : B2/m
9.DE.25Mangani-dellaventuraiteNaNa2(MgMn3+2Ti4+Li)Si8O22O2Mon. 2/m : B2/m
9.DE.25Fluoro-pedriziteNaLi2(Mg2Al2Li)(Si8O22)F2Mon. 2/m : B2/m
9.DE.25Potassic-arfvedsonite[(K,Na)][Na2][Fe2+4Fe3+]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25Mangani-obertiiteNaNa2(Mg3Mn3+Ti4+)Si8O22O2Mon. 2/m : B2/m
9.DE.25Potassic-magnesio-fluoro-arfvedsonite[(K,Na)][Na2][Mg4Fe3+][Si8O22][(F,OH)2]Mon. 2/m : B2/m
9.DE.25Ferro-ferri-pedrizite[Na][Li2][Fe2+2Fe3+2Li]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25Potassic-magnesio-arfvedsonite[K][Na2][Mg4Fe3+]Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25PedriziteNaLi2(LiMg2Al2)(Si8O22)(OH)2Mon. 2/m : B2/m
9.DE.25Ferro-pedriziteNaLi2(Fe2+2Al2Li)Si8O22(OH)2Mon. 2/m : B2/m
9.DE.25Ferro-fluoro-pedriziteNa(Li2)(Fe2+2Al2Li)[Si8O22]F2Mon. 2/m : B2/m
9.DE.25Fluoro-leakeiteNaNa2(Mg2Al2Li)(Si8O22)F2Mon. 2/m : B2/m
9.DE.25Ferro-ferri-obertiiteNaNa2(Fe2+3Fe3+Ti)Si8O22O2Mon. 2/m : B2/m
9.DE.25Ferri-obertiiteNaNa2(Mg3Fe3+Ti)Si8O22O2Mon. 2/m : B2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.23.1Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : P21/b

Other InformationHide

Health Risks:
Dust from asbestiform varieties of actinolite can cause serious and irreversible lung disease when inhaled. Avoid creating or inhaling dust.

Actinolite in petrologyHide

References for ActinoliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kirwan, R. (1794) 16th species: actynolite. in Elements of Mineralogy, 2nd Edition, Volume 1, Elmsly (London) 167-170.
Hawthorne, F.C. (1983) The crystal chemistry of the amphiboles; Introduction. The Canadian Mineralogist: 21: 174.
Hawthorne, F.C. (1983) The crystal chemistry of the amphiboles; Classification and nomenclature. The Canadian Mineralogist: 21: 175-176.
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.
Mandarino, J.A. (1998) The Second List of Additions and Corrections to the Glossary of Mineral Species (1995). The Amphibole Group. Mineralogical Record: 29: 169-174.
Hawthorne, F.C., Oberti, R. (2006) On the classification of amphiboles. The Canadian Mineralogist: 44: 1-21.

Internet Links for ActinoliteHide

Localities for ActinoliteHide

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