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WardsSci000450
Description:
Coarse-grained, with microcline, biotite and horblende phenocrysts.
Description:
Glassy; most specimens float in water.
Description:
Diorite is a mix of dark pyroxene and light andesine provides perfect representation of an intermediate igneous rock.
Description:
Gabbro is Mafic igneous rock formed deep underground consisting of olivine and pyroxene.
Description:
Porphyritic igneous rock containing biotite, feldspar, and hornblende.
Description:
Obsidian is hard black colored, volcanic glass.
Description:
Pumice is light colored glassy rock that floats in water.
Description:
Pyroxenite is ultramafic igneous rock made up of primarily pyroxene minerals.
Description:
Rhyolite is a pale, pink felsic rock with lower density than most igneous rocks.
Description:
Scoria is a dark-colored rock formed from lava with a high gas content.
Catalog Number:
(470226-422)
Description:
Syenite a light-colored rock consisting of feldspars and hornblende.
Description:
Abundant small black phenocrysts in a gray to brown matrix.
Description:
Gray andesite with large, blocky hornblende phenocrysts.
Description:
Grayish black trap rock.
Description:
Classic, dark; from the Columbia Plateau.
Description:
Dark gray with abundant gas pocket vesicles.
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