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).
It is interesting to note that analytical data exist in the literature for at least two amphiboles which fall into the hastingsite field and which are chlorine-dominant; one of these is almost completely characterized but the data for the other consists only of chemical analytical data.
Hastingsite, [Mathematical Expression Omitted], mon.
forms a series with Hastingsite, Amphibole group, Can.