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Cryptomelane, Goethite Serra da Mina Mine, Cercal, Santiago do Cacém, Setúbal District, Portugal Copyright © Pedro Alves

Cryptomelane, Goethite Serra da Mina Mine, Cercal, Santiago do Cacém, Setúbal District, Portugal Copyright © Pedro Alves

Chert can form in parts of the deep sea where the tiny shells of siliceous organisms are concentrated, or elsewhere where underground fluids replace sediments with silica. Chert nodules also occur in limestones.

Explore These Types of Sedimentary Rocks

Chert can form in parts of the deep sea where the tiny shells of siliceous organisms are concentrated, or elsewhere where underground fluids replace sediments with silica. Chert nodules also occur in limestones.

Todorokite, 	(Na,Ca,K)2(Mn++++,Mn+++)6O12•3-4.5(H2O), Pedogna quarry, Villa a Roggio, Pescaglia, Lucca, Province, Tuscany, Italy. Crysral size 0.3 mm. Copyright: Luigi Mattei

Todorokite, (Na,Ca,K)2(Mn++++,Mn+++)6O12•3-4.5(H2O), Pedogna quarry, Villa a Roggio, Pescaglia, Lucca, Province, Tuscany, Italy. Crysral size 0.3 mm. Copyright: Luigi Mattei

Cuivre. Oganja (Onganja), Namibie

Cuivre. Oganja (Onganja), Namibie

Gypsum on Calcite, Sulzkirchen, Main Danube Canal, Upper Palatinate, Bavaria, Germany. Fov 8mm. Collection/Copyright: Georg Prock

Gypsum on Calcite, Sulzkirchen, Main Danube Canal, Upper Palatinate, Bavaria, Germany. Fov 8mm. Collection/Copyright: Georg Prock

Learning Geology: How Do You Describe an Igneous Rock?

Learning Geology: How Do You Describe an Igneous Rock?

Psilomelane (mixture of various Mn oxydes : coronadite, hollandite, etc), Taouz, Er Rachidia, Morocco. Hard crystallized black plate of psilomelane with short stalactitic black psilomelane formations to 9 mm standing upright off the top surface

Psilomelane (mixture of various Mn oxydes : coronadite, hollandite, etc), Taouz, Er Rachidia, Morocco. Hard crystallized black plate of psilomelane with short stalactitic black psilomelane formations to 9 mm standing upright off the top surface

Igneous Rock Color Texture Key

Igneous Rock Color Texture Key

Lavendulan & Acanthite.

Lavendulan & Acanthite.

Gems: Minerals that are rare, beautiful and durable.

Gems: Minerals that are rare, beautiful and durable.

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