pseudomorph by replacement

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• Pseudomorph — In geology, a pseudomorph is a mineral compound resulting from a substitution process in which the appearance and dimensions remain constant, but the mineral which makes up the chief component of the compound is replaced by another. The name… …   Wikipedia

• pseudomorph — noun A mineral that formed by replacement of an existing mineral (or organic matter) such that the new mineral has the appearance and dimensions of the original. Petrified wood is a silicic pseudomorph of the original wood …   Wiktionary

• metasomatic replacement — Process of simultaneous solution and deposition in which one mineral replaces another. It is the method by which wood is petrified (silica replaces the wood fibres), minerals form pseudomorphs (new minerals that preserve the characteristic… …   Universalium

• Bertrandite — is a beryllium sorosilicate hydroxide mineral with composition: Be4Si2O7(OH)2. Bertrandite is a colorless to pale yellow orthorhombic mineral with a hardness of 6 7. It is commonly found in beryllium rich pegmatites and is in part an alteration… …   Wikipedia

• Iddingsite — is an alteration of olivine that consists of a mixture of clay minerals, iron oxides and ferrihydrides. Iddingsite forms from the weathering of basalt in the presence of liquid water and can be described as a phenocryst meaning it has… …   Wikipedia

• Shattuckite — Infobox mineral name = Shattuckite category = boxwidth = boxbgcolor = caption = formula = Cu5(SiO3)4(OH)2 molweight = color = Dark and light blue, turqoise habit = system = twinning = cleavage = perfect in two directions. fracture = uneven mohs …   Wikipedia

• igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium