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The different chemical types are almost impossible to distinguish even by optical or X-ray methods, and detailed chemical analysis using an electron microprobe is required. [11] There is a solid solution series between hornblende and the closely related amphibole minerals, tremolite–actinolite, at elevated temperature.
Magnesiohastingsite is a calcium-containing amphibole and a member of the hornblende group. [5] It is an inosilicate (chain silicate) with the formula NaCa 2 (Mg 4 Fe 3+)(Si 6 Al 2)O 22 (OH) 2 [1] and molar mass 864.69 g. [2]
Pargasite or pargasitic hornblende is a complex inosilicate mineral of the amphibole group with formula NaCa 2 (Mg 4 Al)(Si 6 Al 2)O 22 (OH) 2. It was first described for an occurrence in Pargas, Finland in 1814 and named for the locality. [6] It occurs in high temperature regional metamorphic rocks and in the skarns within contact aureoles ...
The endmember hornblende tschermakite (☐Ca 2 (Mg 3 Al 2)(Si 6 Al 2)O 22 (OH) 2) is a calcium rich monoclinic amphibole mineral. It is frequently synthesized along with its ternary solid solution series members tremolite and cummingtonite so that the thermodynamic properties of its assemblage can be applied to solving other solid solution series from a variety of amphibole minerals.
Amphibolite from Cape Cod, Massachusetts Garnet bearing amphibolite from Val di Fleres, Italy. Amphibolite (/ æ m ˈ f ɪ b ə l aɪ t /) is a metamorphic rock that contains amphibole, especially hornblende and actinolite, as well as plagioclase feldspar, but with little or no quartz.
Edenite or edenitic hornblende is a double chain silicate mineral of the amphibole group with the general chemical composition NaCa 2 Mg 5 (Si 7 Al)O 22 (OH) 2. Edenite is named for the locality of Edenville, Orange County, New York , where it was first described.
Hornblendite from Poland. Hornblendite is a plutonic rock consisting mainly of the amphibole hornblende. Hornblende-rich ultramafic rocks are rare and when hornblende is the dominant mineral phase they are classified as hornblendites with qualifiers such as garnet hornblendite identifying a second abundant contained mineral.
Optical properties: Biaxial (−) ... and is an allusion to its being harder than the amphibole mineral hornblende (a mineral with which it is often confused. ...