CHROMITE, M-195/195A. Philippine Islands.
Black metallic with a little disseminated
serpentine. Some pure enough for specific gravity tests. 

Check for availability.

CHRYSOCOLLA, M-200. Arizona. Vivid blue and blue-green 

crusts and masses with occasional quartz. Check.  

We have some smaller than class pack sizes available at lower price of this

excellent material.  E-mail us.  These are a very nice color, so smaller might work for you.

CHRYSOCOLLA, M-200A. Arizona.
Light sky blue to Robin's Egg blue, up to 50% associated rock.

CHRYSOTILE ASBESTOS, M-205. 
Arizona. Veins in serpentine. Shows the fibrous nature of this

category of mineral.

  
CINNABAR, M-210. Nevada. Varies from lean
coatings and veinlets in and on rock to richer vugs on chert. Check for availability and sizes.  

COAL, see in SEDIMENTARY ROCKS or Metamorphic rocks.

COLEMANITE, M-215. California.
Classic Boron material. Compact, fine sugary colemanite with some crystals. 

COPPER, M-225. Arizona. Thin
sheets and dendritic fissure filling forms.
Little or no accompanying rock. No class packs available.  Check on availability.

COPPER, M-225A.  Michigan.  Tumbled copper pieces from  
the Keweenaw Peninsula.  These pieces imitate those that
were naturally tumbled by glaciers.  

CORUNDUM, M-220. Brown, gray and
bluish pieces of crystals.

RUBY variety CORUNDUM.  M-220R.  India.  Purplish red semi-translucent

crystals showing hexagonal crystal form and some with complete terminations.

1.25 to 1.75 by .75 inch crystals. Check.

CUMMINGTONITE, M-230. 

DANBURITE. M- 235. Mexico. 

DENDRITE, M-240. California.
Fern-like black manganese
oxide markings on white felsite. Faux fossil.

DIAMOND crystals/cubes.  Educational-industrial grade. 

Please check.

DIASPORE, M-245. 
California, Coarse, crystalline, platy
masses usually with minor pyrophyllite
and/or andalusite. SL - Check.

DIATOMITE, (DIATOMACEOUS EARTH) see
OPAL

DIOPSIDE, M-250. Canada.
Grayish green showing cleavage, parting
and occasional crystal faces. 

DOLOMlTE, M-255. California.
Medium to fine grained white to grayish
crystalline masses .