METAMORPHIC ROCKS 

AMPHIBOLITE through MARBLE

AMPHIBOLITE, ME-5. California.
Coarse, black hornblende with some interstitial
plagioclase.

AMPHIBOLITE, ME-5A. California.
30-50% about 1 cm hornblende cleavages in fine
grain lighter green matrix of amphibole and
plagioclase.

 

ANTHRACITE COAL, ME-25. Pennsylvania.

Also listed in sedimentary section with other coals.

Hard, glassy luster, classic hi-grade coal. 


GARNETITE, ME-10.  Nevada.
Massive compact, fine grain, light reddish brown.

 


DIORITE GNEISS, ME-15. California.
Fine to medium grain, predominant white
plagioclase, abundant black hornblende bands.



PORPHYROBLASTIC GNEISS, ME-15A. 

 California. 1-2 mm grayish white feldspar
porphyroblasts in fine to medium grain, foliate
matrix of biotite, quartz and feldspar. Probably
originally granodiorite.  check. Out of stock.



GRANITE GNEISS, ME-15B. 

Fine to medium grain. Salmon pink feldspar groundmass,

 abundant dark biotite banding.



HORNFELS, ME-20. California. Dark
gray to nearly black, compact, very fine grained.

Composed of intermediate alkali 

feldspars and calc-silica minerals.



CORDIERITE HORNFELS, ME-20A. 
Nevada. Dark gray rice-like grains of
cordierite in a groundmass of fine grain
cordierite usually of a lighter color. 

 

MARBLE, ME-35. California.
Medium grain, grayish white, dolomitic.



DOLOMITIC MARBLE, ME-35A.
California. Fine to medium grained. Sparkling
white and may show a little Fe oxide stain.

 

MARBLE, ME-35B.  Medium
grain. Sparkling white.  Georgia.

MARBLE, ME-35D. Crestmore Quarry,
California. Coarse grain, light grayish blue.

MARBLE, ME-35E. California.
Nearly white, coarse to medium grain. Check

TREMOLITE MARBLE, ME-35FF.
California. Singular and radiating glassy
needles of tremolite in fine grain, grayish
dolomitic marble.  Check for small quantities.

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