Gemstones Encyclopedia

Siderite is difficult to cut,

The fibrolite from Burma and

Simpsonite is an extremely rare

Long thought to be brown

Smaltite is a collectors oddity,

Smithsonite occurs across the globe,

Smoky quartz comes in every

Typically blue, durable, and easy

Sphalerite occurs in many colors.

Sphene, also known as titanite,

Although long known best for