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Marcasite reacts more readily than pyrite under conditions of high humidity. The product of this disintegration is iron(II) sulfate and sulfuric acid. The hydrous iron sulfate forms a white powder consisting of the mineral melanterite, FeSO 4 ·7H 2 O. [13] This disintegration of marcasite in mineral collections is known as "pyrite decay".
Marcasite brooch made from pyrite and silver. Marcasite jewellery is jewellery made using cut and polished pieces of pyrite (fool's gold) as gemstone, and not, as the name suggests, from marcasite. [1] Both pyrite and marcasite are chemically iron sulfide, but differ in their crystal structures, giving them different physical properties. Pyrite ...
Mineral symbols (text abbreviations) are used to abbreviate mineral groups, subgroups, and species, just as lettered symbols are used for the chemical elements.. The first set of commonly used mineral symbols was published in 1983 and covered the common rock-forming minerals using 192 two- or three-lettered symbols. [1]
Aqua fortis /spirit of nitre – nitric acid, formed by 2 parts saltpetre in 1 part (pure) oil of vitriol (sulfuric acid). (Historically, this process could not have been used, as 98% oil of vitriol was not available.) Aqua ragia /spirit of turpentine/oil of turpentine/gum turpentine – turpentine, formed by the distillation of pine tree resin.
The meaning of spirituality has developed and expanded over time, and various meanings can be found alongside each other. [1] [2] [3] [note 1] Traditionally, spirituality is referred to a religious process of re-formation which "aims to recover the original shape of man", [note 2] oriented at "the image of God" [4] [5] as exemplified by the founders and sacred texts of the religions of the world.
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The general purpose of rituals is to express some fundamental truth or meaning, evoke spiritual, numinous emotional responses from participants, and/or engage a group of people in unified action to strengthen their communal bonds. The word ritual, when used as an adjective, relates to the noun 'rite', as in rite of passage.
An even clearer evidence of new influences is the shape introduced in the Orientalizing era: The Bullae. A pear-shaped vessel used to hold perfume. Its surface was usually decorated with repoussé and engraved symbolic figures. Much of the jewellery found was not worn by Etruscans, but were made to accompany them in the after world. Most, if ...