Nepheline
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Nepheline, also called nephelite, is a rock-forming mineral in the feldspathoid group – a silica-undersaturated aluminosilicate that occurs in intrusive and volcanic rocks with low silica, and in thei
Nepheline 3
Grayish-white nepheline crystals with dark schorlomite from Bou-Agrao Mount, Tamazeght complex, High Atlas Mountains, Morocco. Size: 6.0 cm × 4.4 cm × 3.8 cm (2.4 in × 1.7 in × 1.5 in)
Silicate mineral
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Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of minerals and make up approximately 90 percent of Earth's crust.
Nepheline
…Nepheline General Category Tectosilicate minerals Group Feldspathoid group Formula (Na,K)AlSiO4 IMA symbol Nph Strunz classification 9.FA.05 Crystal system Hexagonal Crystal class Pyramidal…
Lithium aluminium silicate mineral spodumene
Diatomaceous earth, a biogenic form of silica as viewed under a microscope. The imaged region measures approximately 1.13 by 0.69 mm.
Nesosilicate specimens at the Museum of Geology in South Dakota
Kyanite crystals (unknown scale)