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from the Upper Silurian age
Azurite is a striking copper-based mineral found in shades of deep blue to vivid green
and when exposed to the elements over a long period of time can change into the closely related malachite
The spectacular display of colors these specimens display can be formed by two different geological processes: the oxidation of pyrite causing ultra-thin layers of iron oxide to form on the surface
pyrite is an abundant sulfide mineral that despite some similarities can easily be distinguished from actual gold by its crystal form (typically cuboidal) and being much harder whereas gold is soft and malleable
Rose Calcite Trilobite from the Upper Silurian age
US$ 21577.00
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US$ 44.76
US$ 19579.00
US$ 480.50
US$ 253.50
US$ 44.76
