We're awash in #tectosilicate structures this first half of the #MinCup25: five of the first sixteen, including two today.

A #zeolite and a #feldspathoid

Is tectosilirific a word?

Fair enough, they are the major rock-forming minerals of the crust!

Nepheline syenite with sodalite.
#Sodalite Na8(Al6Si6O24)Cl2 is royal blue varieties widely used as an #ornamental #gemstone. It is a member of the sodalite group with #lazurite, #tugtupte and etec.. First discovered by Europeans 1811 in #Greenland. It is one of the most beautiful #stones for me.

#geo #geology #mineral #Earth #science #feldspathoid #minerology