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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]
The pneumatics ("spiritual", from Greek πνεῦμα, "spirit") were, in Gnosticism, the highest order of humans, the other two orders being psychics and hylics ("matter"). A pneumatic saw themselves as escaping the doom of the material world via the transcendent knowledge of Sophia 's Divine Spark from inner revelation coming from the highest ...
A vendor in Madrid weighs a bunch of grapes at the market on New Year's Eve. / Credit: Europa Press News via Getty Images
The world offers many shortcuts, false promises and temporary pleasures that seem appealing at the moment but ultimately slow us down in our pursuit of God.
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 ...
With each step, the symbolic names (Deckname, or code name) used to indicate the critical ingredients are changed, just as the ingredients themselves are transformed. The keys are written in such a fashion as to conceal as well as to illuminate: only a knowledgeable reader or alchemical adept was expected to correctly interpret the veiled ...