Gerstmannite, (Mn,Mg)Mg(OH),[ZnSiOn], orthorhombic, a 8.185(7), b 18.65(2), c 6.256n4, Z : 8, space group Bbcm, occurs as white to pale-pink mats and sprays of bunched prismatic crystals associated with calcite, manganpyrosmalite, and sphalerite in a hydrothermal vein paragenesis which cuts normal franklinite-willemite "buckshot" ore from the Sterling Hil l Mine, Ogdensburg, Sussex County, New ...

Apatite is typically characterized by a wide variety of spectrum and kinetic characteristics luminescence; luminescent images grains are often zonal. A conditions for the formation mineral in various types associations many host rocks contributes to occurrence impurities luminogen ions its structure. The luminescence associated with d-metals, REE, different anions, as well effects co-activation...

Abstract The paragenesis of carbonate pseudomorphic textures in the rock record that are inferred to represent replaced metastable ikaite (CaCO3·6H2O), which forms at frigid temperatures, is uncertain. Petrographic analysis Mono Lake (California, USA) Pleistocene tufas allowed recognition a distinctive calcite microtexture, termed guttulatic calcite, during dehydration and diagnostic for precur...

The case study presented here deals with the Pb-Zn-Cu skarn ores hosted in Rosas Shear Zone (RSZ), a highly strained domain located external zone of Sardinian Variscan chain. RSZ is characterized by several tectonic slices Cambrian limestones within strongly folded and foliated Cambrian-Ordovician siliciclastic succession, intruded late granites mafic dykes. Based on geological mapping, structu...