Aenigmatite and its variety cossyrite are rare minerals forming constituents of igneous rocks of the nepheline-syenite and phonolite groups. Image Credit: Wikipedia (public domain) ...

Aenigmatite, a Ti-Na silicate with abundant FeO and important amounts of MnO, occurs in the groundmass of phonolites. Astrophyllite was described for the first time in Poços de Caldas by Ashry (1962) ...

Aenigmatite, astrophyllite -- pt. 3, Sheet silicates. Mica group. Stilpnomelane. Pyrophyllite, talc. Chlorite. Serpentine. Clay minerals. Apophyllite. Prehnite -- pt. 4, Framework silicates. Feldspar ...

The magma that formed the stones was particularly low in aluminum, which led to uncommon minerals, such as arfvedsonite, aegirine, and aenigmatite in the granite, Newscripts learned from a blog post ...

The magma that formed the stones was particularly low in aluminum, which led to uncommon minerals, such as arfvedsonite, aegirine, and aenigmatite in the granite, Newscripts learned from a blog ...

Few people would have heard of Mount Nyiragongo before its current eruption. There are some cities that we know live in the shadow of a volcano. Naples and Vesuvius, Catania and Etna, Seattle and R… ...

The oceanic-island magmatic systems of the Atlantic Ocean exhibit significant diversity in their respective sizes, ages, and the compositional ranges of their eruptive products. Nevertheless, almost ...

Aenigmatite (an iron sodium titanium silicate) almost shouldn't be an inosilicate - its chains branch left and right alternately at intervals. This miniature of lamellar aenigmatite comes from Mount ...

Abstract Mount Etinde is a Recent (<1 Ma) strombolian-type volcano located on the southern flank of Mount Cameroon. Mount Etinde lavas are distinguished on the basis of the mineralogical compositions ...

ABSTRACT: The Late Cretaceous Búzios Island alkaline massif intrudes Precambrian charnockites and consists dominantly of syenitic rocks that are cut by a large number of dikes, mostly NE-trending, and ...