1.
Overview:Hauyne, haüyne (), hauynite or haüynite is a tectosilicate sulfate mineral with endmember formula Na3Ca(Si3Al3)O12(SO4). As much as 5 wt % K2O may be present, and also H2O and Cl. It is a feldspathoid ...
2.
Overview:Sodalite is a rich royal blue tectosilicate mineral widely used as an ornamental gemstone. Although massive sodalite samples are opaque, crystals are usually transparent to translucent. Sodalite is a member ...
3.
Overview:Afghanite, (Na,K)22Ca10[Si24Al24O96](SO4)6Cl6, is a hydrous sodium, calcium, potassium, sulfate, chloride, carbonate alumino-silicate mineral. Afghanite is a feldspathoid of the cancrinite group and t ...
4.
Overview:Nosean, also known as Noselite, is a mineral of the feldspathoid group with formula: Na8Al6Si6O24(SO4). H2O. It forms isometric crystals of variable color: white, grey, blue, green, to brown. It has a ...
5.
Overview:Tugtupite is a beryllium aluminium tectosilicate. It also contains sodium and chlorine and has the formula Na4AlBeSi4O12Cl. Tugtupite is a member of the silica deficient feldspathoid mineral group. It ...
6.
Leucite
Potassium and aluminium tectosilicate mineral
Overview:Leucite is a rock-forming mineral composed of potassium and aluminium tectosilicate K[AlSi2O6]. Crystals have the form of cubic icositetrahedra but, as first observed by Sir David Brewster in 1821, they ...
7.
Nepheline
A silica-undersaturated aluminosilicate mineral
Overview:Nepheline, also called nephelite (from Greek: νεφέλη, "cloud"), is a feldspathoid: a silica-undersaturated aluminosilicate, Na3KAl4Si4O16, that occurs in intrusive and volcanic rocks with low silica, and ...
8.
Lazurite
A tectosilicate mineral and a member of the sodalite group
Overview:Lazurite is a tectosilicate mineral with sulfate, sulfur and chloride with formula: (Na,Ca)8[(S,Cl,SO4,OH)2|(Al6Si6O24)]. It is a feldspathoid and a member of the sodalite group. Lazurite crystallizes ...
9.
Kalsilite
A vitreous white to grey feldspathoidal mineral
Overview:Kalsilite (KAlSiO4) is a vitreous white to grey feldspathoidal mineral that is found in some potassium-rich lavas, such as from Chamengo Crater in Uganda. It has a relative hardness of 5.5.
10.
Overview:Davidsmithite is a Ca-bearing nepheline-group mineral with the formula (Ca,◻)2Na6Al8Si8O32, with the "◻" being a vacancy in the formula. It is a feldspathoid mineral that occurs as a rock forming in the ...
11.
Overview:The feldspathoids are a group of tectosilicate minerals which resemble feldspars but have a different structure and much lower silica content. They occur in rare and unusual types of igneous rocks, and ...
12.
Overview:Farneseite is a mineral from the cancrinite sodalite group with 14 layer stacking. It is a complex silicate mineral with formula: (Na,Ca,K)56(Al6Si6O24)7(SO4)12·6H2O. It was named after a location in ...
