agate

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agate

Geology
A microcrystalline silicate, which is characterised by fine grain and bright colours.
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This property adjoins the acclaimed historic fire agate gemstone mines, 'The One Track Mine' and 'The Deer Creek Fire Agate Mine', otherwise known as The Penny Pit.
Thomas creates lamp finials out of slivers of malachite, howlite and agate, as well as unusual specimens like inky iridescent labradorite, creamy blue-tinged chrysophase and petrified wood.
Native Americans considered chalcedony -- the family of minerals that includes jasper, onyx and agate -- capable of imparting strength and courage.
Geologically speaking, agates are nodular masses comprising one or more varieties of quartz, particularly chalcedony.
Part of the fascination of agates is the wide range of forms and colours they can exhibit, no two agates looking exactly alike.
The names are derived from the ranches on which the agates are found, or the nearest railroad station, or perhaps a nearby village.
Slabbed and polished agates are legitimate mineral specimens, of course, but Keilmann well knows that not everyone in the mineral world is interested in cryptocrystalline minerals.
Observing agate slices with transmission electron microscopy and ion mass spectroscopy, the two scientists found that the size of the tiny crystals and the degree of impurities change cyclically, forming the iris band's crystal pattern.