"Boca de Tubarão" do basalto Brasileiro / "Boca de Tubarão" from Brazilian Basalt
Do basalto central do Brasil, rocha metamórfica encontrada da superfície até 10m de profundidade. Chamamos de geodo quando é um conjunto de cristais agrupados, alguns parecem uma fruta oca, um ovo e esse parece um monte de dentes de tubarão!
Quando é um pouco menor que um geodo, damos o nome de drusa.
O quartzo quando é facetado tem 6 faces, mas essas pontas aí tem apenas 3, não se se é outro mineral ou se as demais faces se formariam mais abaixo, onde todas as pontas se misturam na base. Em cima dessas pontas de 3 lados, há uma espécie de "açúcar cristal", uma nova camada de cristais menores que começaram a ser formar, mas não cresceram.
Essa amostra do grupo dos silicatos é comum no basalto central, serve para ornamento, jardinagem ou artesanato
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From the central basalt of Brazil, metamorphic rock found from the surface to 10m in depth. We call it a geode when it's a cluster of crystals grouped together, some look like a hollow fruit, an egg and this one looks like a bunch of shark teeth!
When it's a little smaller than a geode, we call it a druse.
When quartz is faceted, it has 6 faces, but these points have only 3, not if it is another mineral or if the other faces would form further down, where all the points are mixed at the base. On top of these 3-sided tips is a kind of "crystal sugar", a new layer of smaller crystals that have started to form but have not grown.
This sample of the silicate group is common in central basalt, it is used for ornaments, gardening or crafts.
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