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|System:||Monoclinic||Colour:||black-green, dark green|
|Lustre:||Vitreous||Hardness:||5 - 6|
|Tremolite-actinolite group > Calcium Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup|
|Name:||Named in 1946 by Nils Sundius for its relationship to Actinolite.|
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.
Classification of Ferro-Actinolite
|Strunz 8th edition ID:||8/F.10-30|
|Nickel-Strunz 10th (pending) edition ID:||9.DE.10|
9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
|Hey's CIM Ref.:||14.22.6|
14 : Silicates not Containing Aluminum
22 : Silicates of Fe and Ca
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Physical Properties of Ferro-Actinolite
|Colour:||black-green, dark green|
|Hardness (Mohs):||5 - 6|
Crystallography of Ferro-Actinolite
|Cell Parameters:||a = 9.91Å, b = 18.17Å, c = 5.27Å|
β = 104.98°
|Ratio:||a:b:c = 0.545 : 1 : 0.29|
|Unit Cell Volume:||V 916.69 Å³ (Calculated from Unit Cell)|
Optical Data of Ferro-Actinolite
|RI values:||nα = 1.668 nβ = 1.685 nγ = 1.702|
|2V:||Measured: 10° to 12°, Calculated: 88°|
|Maximum Birefringence:||δ = 0.034|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r > v or r < v|
Chemical Properties of Ferro-Actinolite
|Essential elements:||Ca, Fe, H, O, Si|
|All elements listed in formula:||Ca, Fe, H, O, Si|
Relationship of Ferro-Actinolite to other Species
|Series:||Forms a series with Actinolite (see here)|
Forms a series with Tremolite (see here)
|Member of:||Tremolite-actinolite group > Calcium Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group > Amphibole Supergroup|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Ferro-Actinolite
|Health Warning:||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-Actinolite
Mineralogical Record: 29: 169-174.
Ishida, K. Hawthorne, F.C., and Ando, Y. (2002) Fine structure of infrared OH-stretching bands in natural and heat-treated amphiboles of the tremolite-ferroactinolite series. American Mineralogist: 87: 891-898.
Hawthorne, F. C. and Oberti, R. (2006): On the classification of amphiboles. Canadian Mineralogist 44, 1-21.
Internet Links for Ferro-Actinolite
Localities for Ferro-Actinolite
The 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. ? 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.
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Locality Updated: Forsythe Mine, Cooksville, Howard Co., Maryland, USAFrom Bill Cordua, 9th Dec 2013 04:44:50