Grape chalcedony - crystallized mineral

Grape chalcedony - Crystallized mineral
40 years of history Crystals-Rock Shop at the center of Barcelona and online

Chalcedony is a mineral of silica, before it was considered a variety of quartz, currently it is considered a mixture of quartz with moganite.

The chalcedony is formed from the precipitation of silicates in groundwater or on the earth's surface.

Precipitation of silicates can be caused by the interaction of groundwater with silica-rich rocks or by direct precipitation of silicates dissolved in groundwater.

The chalcedony is deposited on the surface of the rock or in underground cavities, forming nodes, needles or masses.

Chalcedony occurs in a wide variety of colors, including white, gray, brown, green, and purple, depending on the presence of other minerals< /strong> and elements in the mineralized solution.

Approximate size (width x depth x height): 1.8 x 1.6 x 1.1 cm.
Photographs and size are from a random sample of the product for sale

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In our physical minerals store in the center of Barcelona we have a much greater variety of minerals than those that appear on the web. If you do not find what you are looking for on the web, you can contact us, we will be happy to assist you.