ANHYDRITE, see in Minerals Section

ANTHRACITE, see COAL

ARGILLITE, S-5. Wisconsin. Fine
grained, brick red.  Pipestone. 
BITUMINOUS COAL, see under COAL

BRECCIA. S-10. California. White to
gray or brown rock fragments in dark brown iron
oxide. (Note: Supply spotty. Suggest substitute
S- 10-A or S-10-D).           

JASPEROID-CHERT BRECCIA, S-10-A.
Arizona or South Dakota. Gray and other colored chert
fragments, 3-15 mm, in light brown to red jasperoid.
Class pack 20 - .

BRECCIA. S-10-B. California. Pale
gray, siliceous, 2-15 mm rock fragments with
minor quartz veins in fine grain, light tan
matrix.  

CHERT-CALCITE BRECCIA, S-10-C. 
Nevada. Grayish to brownish chert
fragments and white calcite cleavages.
Limonitic bond.  

CHERT-LIMESTONE BRECCIA, S-10-D. 
Kansas. White, gray and brown limestone
and chert fragments and lime cement.  Our best breccia

right now.  

OPAL BRECCIA, S-10-E. Nevada.
Colorful, red, brown and yellow opal fragments
cemented together by opal.  

CALICHE BRECCIA, S-10-F. Nevada.
Light buff matrix with angular fragments of
colorful chert-jasper and limestone.  

CHERT, S-15. Kansas. Boone
Formation. Light gray.

CHERT, S-15-A. Nevada. Gray, with
scattered red mottlings.

CHERT, S-15-B. Nevada. Various
pale to vivid shades of green.

Chert variety Flint.  England.

CALICHE, see under LIMESTONE

CHALK, see under LIMESTONE

CLAYSTONE, S-20. California.
Unconsolidated lumps. Melts at cones 32 to
34 (near 3000 deg. F).  

COAL (ANTHRACITE), S-25 or ME-25. 

See metamorphic section.  Listed here as part of the coal

series.

COAL (BITUMINOUS), S-25-A. 
 Layered, velvet black.  

COAL (LIGNITE), S-25-B. 
Brown to black. Somewhat friable. 

CONGLOMERATE, S-30. Utah.
Shinarump Member of the Chinle Formation.

Quartzose conglomerate with colorful 4-30
mm pebbles in medium grain sandy matrix.

Note that we have increased the price of this 

class pack of 20 pieces to guarantee each piece shows good pebbles.  Thus, the size of most pieces has increased making them almost like our 1x1x1 inch size (if you are not familiar with this larger size it is often 1.5x1.25x1.25).  When we tried to break into the normal class pack size, we found we were destroying many of the best pieces.  All of this material is processed by hand to effectively show the desired attributes.
 

CONGLOMERATE, S-30-C. Nevada. Quartzose 

conglomerate with abundant 4-30 mm pebbles in medium grain 

reddish-brown matrix.  Many small pebbles so each piece displays

conglomerate characteristics well.  From near Adobe Peak, Elko County, Nevada. 

LIMESTONE CONGLOMERATE, see under
LIMESTONE