SERPENTINE, M-575. California . State Rock.
Greenish-black, very fine grain, most  pieces have lighter apple green slickensides present.  Check.

SIDERITE, M-580. Idaho. Very coarse
crystalline light to dark brown masses showing
cleavage faces. 

SILLIMANITE, M-585. South Dakota.
Mostly acicular masses, some bladed or platy
Yellowish to brownish to blue. Check.  

SMITHSONITE, M-590. New
Mexico. Light blue-gray botryoidal masses.

SPHALERITE, M-595.. Missouri or Tennessee.
Cleaved masses, some with crystal faces.
Excellent material now available.   Check for pricing.

SPHALERITE, M-595A. Wisconsin. Massive, medium grain. Reddish brown to silver gray. Fine example of supergene enrichment style zinc ore. 
Check.

SPODUMENE, M-600. South Dakota.
White to light gray cleavages.  Click Here to see location

SPURRITE, M-605. New Mexico.
Lavender to bluish-gray crystalline.  Check for availability.

STIBNITE, M-610. Nevada.

Pure metallic gray-black crystals of stibnite. Crystals up to three inches, no associated rock.  Sold by crystal.  

Up to 3".  Check on prices and availability.

STIBNITE, M-610A. Nevada. Compact,
bladed, gray metallic masses with very little, if
any, rock. Check for availability.

STIBNITE, M- 610B. Nevada. Metallic
gray blades and masses in rock. Check.

STILBITE, M-615. India.
Generous amounts of 1-3 mm crystals in
and on basalt. 

SULFUR, M-620. Various locations.
Light to bright to matte yellow, pure sulfur masses.

Industry grade, no impurities.

 

TALC (SOAPSTONE), M-625. Various locations.

Soapy feeling in light olive brown,
pale green or white color.  Steatite also in gray. 
TALC, M-630. China.
White, green or pink. Excellent quality.  Good for
hardness test. 

THENARDITE, M-635. 
Arizona. Transparent to translucent gray cleavages 

with some inclusions. SL

We have quite a few hand size specimens of thenardite crystals.

Check.

TITANITE, see under SPHENE

TOURMALINE, M-645. Prism sections of black tourmaline, generally regarded as schorl, much showing deep striations. Check for pricing. 

TOURMALINE, M-645A. China..

Ask for price.  Excellent shiny black prisms and prism sections with very good luster.  

TRAVERTINE, see under CALCITE