hastingsite

hastingsite

[′hās·tiŋ‚zīt]
(mineralogy)
NaCa2(Fe,Mg)5 Al2Si6O22(OH)2 A mineral of the amphibole group crystallizing in the monoclinic system and composed chiefly of sodium, calcium, and iron, but usually with some potassium and magnesium.
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References in periodicals archive ?
Essential minerals are phenocrysts and glomerocrysts of anorthoclase, sanidine up to 1,5 cm and anorthoclase-mantled plagioclase; accessory minerals are red biotite, and hastingsite while trace minerals are augite, zircon, sphene and magnetite.
Accessory and trace minerals are corroded and oxidized hastingsite (Figure 6), euhedral zircon and euhedral sphene.
In the glassy matrix there were identified finer crystals of anorthoclase, hastingsite, oxihornblende and sphene.
there was no chemical and no physical equilibrium between plagioclase and hastingsite crystals and the melt, as suggested by dissolution texture, reabsortion and reaction borders (Figures 6A, 613, 6E, 14D).
These rocks were classified as alkaline rhyolites crystal-vitric tuffs, with aligned sanidine, anorthoclase, hastingsite and sphene crystals in a glassy matrix (Pardo, 2004).