IGNEOUS 

Please ask for all prices 

 

GRANITIC APLITE through PERIDOTITE


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

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

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

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

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

MUSCOVITE-BIOTITE GRANITE, IG-70L.
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.  Brown also available.

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

hornblende and biotite. OOS.

GRANODIORITE, IG-75.
Gray, medium grain.

Standard San Gabriel Mtns


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. Nevada.
Dark gray to black,vitreous, 

conchoidal fracture.

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

Largest size 1x2 inch at this time.

Limited stock, check for availability.

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

 

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

fracture and chipped tool technique. 2-2.5 inches.  


ORENDITE, see LEUCITE PHONOLITE

PEGMATITE, see under GRANITE

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

Same as mineral Olivine M-490

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

Limited supply. 


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