ADAMELLITE (QUARTZ MONZONITE), IG-5.
California. Medium to coarse grain, light
pink, minor biotite in 1-3 mm grains. Check for availability of sizes.
ALASKITE, see under GRANITE.
ANDESITE PORPHYRY, IG-10.
California. Phenocrysts of white plagioclase crystals, 5mm to 1 cm,
in compact gray or red groundmass. Check.
AMYGDALOIDAL ANDESITE, IG-10C. Amygdules, usually lined with
analcite crystals in brown andesite matrix. Check for p&a. Some larger sizes, no small sizes.
HORNBLENDE ANDESITE, IG-10D.
Nevada. Porphyritic. Scattered black
vitreous hornblende phenocrysts to 1 cm
in light to dark gray or hematite rich red-gray groundmass.
AUGITE ANDESITE, IG-10H.
Porphyritic with 0.2-2 mm
phenocrysts of andesine and augite in light
gray fine grain groundmass.
Andesite. The only two andesites we continuously have in stock in most
sizes are the Hornblende Andesite, IG-10D, and Augite Andesite, IG-10H.
You can request other andesites but our stock and sizes available may be
limited.
ANORTHOSITE, IG-15. California.
Light gray to light lavender-gray andesine
feldspar with occasional minor hypersthene
or chlorite.
ANORTHOSITE, IG- 15A. New York.
Dark gray to nearly black labradorite.
Note: The only basalts we can guarantee having in
stock right now are IG-20B Vesicular basalt from Pisgah Crater;
IG-20H, a dense black basalt; and a red to brown basalt scoria IG-120A listed
under scoria in this igneous section. You can request the other basalts but we
may only have them in limited sizes and amounts.
BASALT, IG-20. California. medium
fine grained, gray olivine basalt with minor
vesicles up to 1 mm.
BASALT, IG-20A. San Gabriel Mts.,
California. Dense, fine grain, nearly black.
Scattered phenocrysts of plagioclase and olivine
up to 3 mm.
VESICULAR BASALT, IG-20B. California. Dark
gray, fine grained olivine basalt with vesicles
from 2 to 10 mm or larger.
AMYGDALOIDAL BASALT, IG- 20C.
Oregon. Dense, aphanitic, black with
amygdules from 5 mm to over 1 cm lined or filled
with abundant zeolite. 2x3 largest size.
BASALT, IG-20D. California. Dense
medium-fine grain, nearly black with
conspicuous olivine grains around 2 mm.
BASALT, IG-20E. California. Dense
medium-fine grain, gray, 2 mm grains of
conspicuous olivine.
BASALT, IG-20F. California. Dark
gray, fine grain, 1-2 mm irregularly shaped
vesicles, plagioclase and olivine crystals up to 5
mm.
VESICULAR BASALT, IG-20G.
California. Reddish brown, flattened and
elongated vesicles 1-10 mrn, scattered
plagioclase crystals up to 3 mm.
phenocrysts of andesine and augite in light
reddish gray partially devitrified glass.
BASALT, IG-20H. Nevada. Dense,
black, aphanitic. Very sparse olivine to none. In Stock
BASALT, IG-20I. Deccan
Formation, India. Grayish green, some light
to dark mottling, aphanitic. We have some of this material.
Check.
XENOLITHIC OLIVINE BASALT, IG-20L.
Nevada. Nearly black, 3 or 4 to
30 mm masses of olivine torn from the
mantle, occasional phenocrysts of
plagioclase and abundant black pyroxene.
PORPHYRITIC BASALT, IG-20M.
Idaho. "Bird track" arrangement of
plagioclase laths averaging 1x6 mm in
medium gray matrix. Some small quantities, check.
PERIDOT with BASALT, IG-20-P. San Carlos Indian
Reservation, Arizona. Rich clusters of consolidated peridot sand. Crystal
size up to 3 mm with surrounding basalt matrix. No class pack of 20 pieces.
1x2 size and up. In Stock
BRECCIA (VOLCANIC), IG-25.
Brown and gray
fragments, 1 to 10 mm or more, in a dull aphanitic
matrix.
Other VOLCANIC BRECCIA under RHYOLITE
CAMPTONITE. IG-30. Cost A. Arizona.
Gray, fine grained with 1-4 cm
black kaersutite phenocrysts and scattered
amygdules and vugs to 2 cm lined or filled
with calcite.
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