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Mineral Sequence in the Cady Mountains
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Crystals grow where basalt flows
Basalt flows and coarse sand filled early Miocene extensional basins 20 million years ago. Vesicles formed by large gas bubbles in the basalt were focal points for deposition of aragonite, blue agate, sparkling quartz, pointed calcite crystals, and round balls of fluorite. After the basalt was faulted, twinned calcite crystals filled the fractures. As ground water dissolved the calcite, shelf agate grew from fracture vents. Hot fluids then deposited green and purple octahedral flourites on the shelf agate.
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Calcite scalenohedron
Aragonite
Fluorite
Aragonite
Fluorite
Fluorite
Fluorite
Fluorite
Calcite scalenohedron
Calcite scalenohedron twin
Calcite scalenohedron
Calcite scalenohedron
Quartz over aragonite
Chalcedony var. jasper
Calcite scalenohedron twin
Fluorite
Calcite scalenohedron
Fluorite (round) on quartz
Fluorite (round) on quartz
Fluorite
Hematite with quartz, aragonite
Stilbite
Fluorite
Quartz-agate geode
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Rocks, Minerals, Crystals & Ores
Mineral sequence - paragenesis
(mineralogy)
The association and order of crystallization of minerals in a rock or vein.
The effect of one mineral on the development of another. Also known as mineral sequence; paragenetic sequence.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
