Browse Items (1651 total)

Nepheline Syenite. Thin, dark vein runs through the center body of the rock.

Gray, less mafic than average
Representative of main rock type in quarry

Mostly light colored with small darker bits

Hand Sample: Aphanitic medium gray nephlenite. White intergrowth crystals are common throughout the sample and form long strands (approx. 0.6 - 1cm in length) on sides of sample. Sample contains some melilite.

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Contains biotite, orthoclase, hornblende, quartz, and titaniferous magnetite

Especially dark (not typical)

Leucocratic

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OCR PDF of supplemental information for the Northern Apennines Ophiolites collection.