Gemstones Encyclopedia

Extraordinarily difficult to cut, spodumene

An attractive but uncommon mineral,

Star sapphire is a type

Staurolite crystals in opaque cross

Rare stibiotantalite possesses an interesting

Stichtite is not facetable, but

Stolzite is a rare mineral;

Strontianite is a collector’s oddity,

What is the color of

Although sulfur is very abundant,

Sunstones contain hematite or goethite

Taaffeite reacts to most gemological