GRANITE, IG-70G. Cost A. Georgia. Medium
grain, "salt and pepper" black and white, biotite
granite.

GRANITE PORPHYRY, IG-70H. Cost A.
Wyoming. Pink feldspar phenocrysts.

GRANITE (ALASKITE), IG-70I. Cost A. Pre-
Cambrian, Arizona. Medium to coarse, pink. No
mafics.

GRANITE PORPHYRY, IG-70J. Cost A .
California. Coarse grained, pink alkali feldspar
phenocrysts up to 2 cm. Biotite.

GRANITE,IG-70K. Cost A. California. Biotite.
Coarse grained, light color. pink alkali feldspar.
Hint of gneiss texture.

MUSCOVITE-BIOTITE GRANITE, IG-70L.
Cost A. Concord, New Hampshire. Medium
grain, very light gray. About 2 mm muscovite
and biotite flakes.

GRANITE PORPHYRY, IG-70M. 
Texas. Biotite-hornblende. Low end of coarse
grained groundmass. Pink alkali feldspar.
Phenocrysts averaging 20-25 mm.

GRANITE (BIOTITE), IG-70N. 
California. Coarse grain, light pink feldspar.

GRANITE, IG-70O. Texas. Reddish
pink, medium to coarse grained, hornblende-
biotite.  This is our most popular granite for clearly displaying

granite properties and content.  If you want a granite showing pink

microcline, this is the one to get.

HORNBLENDE-BIOTITE GRANITE, IG-70P.
Cost A. Wyoming. Red-brown, medium grain with

hornblende and biotite.

TOURMALINE PEGMATITE, IG-70T, Cryo-Genie Tourmaline

mine, San Diego County, California.  This mine produces gem-quality

elbaite tourmalines.  However, the tourmaline associated with the white

microcline and clear to smoky quartz in this pegmatite is a black schorl

tourmaline.  Only 1x1 size and up available.  Too coarse grain to display

properly in class pack of 20 size.

GRANODIORITE, IG-75. Gray, medium grain.


HARZBURGITE, see PERIDOTITE

IGNIMBRITE, see WELDED TUFF

LAMPROPHYRE, see CAMPTONITE,
MONCHIQUITE

LATITE, see TRACHYANDESITE

LAURVIGITE (LARVIKITE), SEE UNDER
ANORTHITE in Minerals Section of Catalog


NORITE, see GABBRO

OBSIDIAN, IG-85. Cost A. Nevada.
Dark gray to black,vitreous, conchoidal fracture.

OBSIDIAN (Mahogany), IG-85A. Cost K. Nevada.
Vitreous. conchoidal fracture, various shades of brown
to reddish, some mottled or streaked with black. Class

pack of 20 - $15.00. Limited stock, check for availability.

Largest size 1x2 inch at this time.

OBSIDIAN, IG-85B. Cost A. Califomia.
Resinous to pitchy. nearly black with small
white flecks.  Class pack - $9.

OBSIDIAN "ARROWHEADS". 
Black,vitreous, knapped arrowpoints.  Displays conchoidal 

fracture and chipped tool technique. 2-2.5 inches.  

$.75 each.  20 for $12.

ORENDITE, see LEUCITE PHONOLITE

PEGMATITE, see under GRANITE

PERIDOTITE (DUNITE), IG-90. Cost J  Click on link to see images.

North Carolina. Dense to sugary light grayish, olive, grass green.

Limited supply. Class Pack of 20 $10.00