Orbicular Rocks in Finland
Orbicular Rocks in Finland

Author: Seppo I. Lahti

Publisher:

Published: 2005

Total Pages: 188

ISBN-13:

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The orbicular rocks of Finland are various plutonic rocks. In this publication 29 bedrock and 61 boulder occurrences are described. Solitary boulders and boulder fans of orbicular rock are evidently derived from at least 50 separate bedrock occurences. Most of the orbicular rocks are recorded from Proterozoic bedrock (age 1.50-1.90 Ga), with relatively few discoveries from the Archaean basement areas (age 2.50-3.20 Ga). In addition, orbicular carbonatite has been encounteered in the late Devonian Sokli carbonatite intrusion (age 365 Ma).

Handbook of Rocks, Minerals, and Gemstones
Handbook of Rocks, Minerals, and Gemstones

Author: Walter Schumann

Publisher: Houghton Mifflin Harcourt

Published: 1993

Total Pages: 390

ISBN-13: 9780395511374

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Contains descriptions and photographs of approximately six hundred minerals, rocks, and meteorites, providing information about the history, origin, structure, composition, properties, classification, and location of each specimen.