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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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