The beautifully glittering sun quartz bears the charming name\nof Aventurine. A shower of golden or silvery dots makes all their appeal and\nthe dull and dull “aventurines” that are sometimes presented to us do\nnot deserve their name. Other minerals have brilliant inclusions, so they can\nat best be called “adventurized stones”.<\/p>\n\n\n\n
It is rare that a natural phenomenon is referred to as a\nmanufactured product, so beautiful and so precious. But the fact is there: the\naventurine stone comes out of anonymity around 1600 thanks to an artistic\ntechnique and a process of manufacture of the master glassmakers of Murano near\nVenice.<\/p>\n\n\n\n
Mineralogical\ncharacteristics of aventurine<\/strong><\/p>\n\n\n\n Aventurine is a variety of quartz, itself classified in the\ngroup of silicates and in the subgroup of tectosilicates. Like the\nchalcedonies, the aventurine is cryptocrystalline quartz, ie formed of\nmicroscopic crystalline granules; this particular composition gives to the\nmineral an opaque aspect.<\/p>\n\n\n\n Adventurine has other features common to quartz, however its\nhardness is slightly lower (6.5 instead of 7 on a scale of 10) and its density\nslightly higher. The presence of mineral or metallic inclusions explains these\ndifferences.<\/p>\n\n\n\n The color comes from these inclusions: the more they are\nabundant (usually 10 to 20% of the matter) the more the aventurine will be\ncolored in a uniform way.<\/p>\n\n\n\n Micaceous inclusions are the most common. Mica, formed of\naluminum and potassium, is also a silicate but belongs to another group:\nphyllosilicates. It comes in several species and subspecies of composition and\nthus of various colors. The green aventurine, very widespread and appreciated\nfor the intensity of its shades owes its color to the fuchsite, rich chromium\nmica of the muscovite species.<\/p>\n\n\n\n Other inclusions are possible: brown aventurine is colored by\npyrite, red by hematite, goethite or copper, blue by dumor\u00e9rite or ilmenite.<\/p>\n\n\n\n The aventurine is everywhere; it is formed in the magmatic\nand metamorphic rocks into multiform aggregates (nodules, stalactites, pebbles\n…). The main extraction sites are in India (State of Tamil Nadu), Brazil\n(State of Minas Gerais), Russia (Urals and Siberia), Tanzania, and Tibet,\nUnited States (State of Vermont), in Central Europe (Bohemia, Silesia), Spain,\nAustria, and France (Finist\u00e8re).<\/p>\n\n\n\n Wholesale Crystal Massage Wands Suppliers<\/strong><\/a><\/strong><\/p>\n\n\n\n The\naventurescence<\/strong><\/p>\n\n\n\n This name is given to the shiny and glittery appearance\nproduced by light reflected in mineral or metallic inclusions. This term does\nnot apply only to aventurine. Other minerals have this characteristic: for\nexample, iolite or some feldspar such as sunstone, especially that from Oregon\n(known as Oregon sunstone), very clear and very colorful with inclusions of\ncopper.<\/p>\n\n\n\n The beautiful adventurines are rarely found and most of those\noffered for sale have unfortunately an insufficient adventure. Adventurines without any adventures are\nmostly brightly colored crystals used for low cost jewelry. A wide range of colors\nis sure to announce an artificial treatment!<\/p>\n\n\n\n The misleading name \u201cIndian jade ” sometimes refers to green aventurine.\nJade and amazonite are rarer then the aventurine of the same color sometimes\nreplaces them. The vases, cups and other small objects in green aventurine have\na beautiful fresh and frosty appearance. Jewelers frequently carve cabochon\naventurine to reveal the beauty of this semi-precious stone.<\/p>\n\n\n\n Etymology\nand meaning of the word “Aventurine”<\/strong><\/p>\n\n\n\n Aventurine derives from the word “adventure”, a\nterm from the popular Latin adventura (“what must happen”) , from the\nverb advenire (“to occur”,\n“to happen”). In ancient French, the word takes the meaning of\n“fate, destiny” (meaning that we still find in the phrase “good\nadventure”). Adventure is finally and also chance, a meaning found in the\nadverbial phrase \u201cadventure \u201c(if by chance, you go on an adventure, come what\nmay!)<\/p>\n\n\n\n At the beginning of the seventeenth century, a glass worker\nwhose name is unknown would have dropped at random \u201cper aventura ” flakes of copper or brass filings in the\nmolten glass. Maladresse or will to innovate? No one knows but the result is\nconclusive. The glass containing a constellation of glittering particles is a\ngreat success and becomes the adventurine or aventurine , specialty and\nmonopoly of the Venetian master glassmakers (we speak of “aventurine\nglass” or avventurina ).<\/p>\n\n\n\n Subsequently, all things are dotted with small bright dots of\n“adventurine” including natural things as the stone aventurine\n(pietra venturina).<\/p>\n\n\n\n Some argue for the opposite of this explanation: it might be\nnatural adventurine that gave its name to the artificial. This version is\nunlikely because there is no trace of this name before. It is also possible\nthat the glassmakers invented the story in response to the curious too\ninterested in their manufacturing secrets. Chance does things well and cannot\nbe explained!<\/p>\n\n\n\n In France, the first written trace of the stone called\n“aventurine” dates from 1686. We owe this testimony to a very famous\nlady of this century, Madame de Maintenon: \u201cI found that a rosary that I\nbelieved the nuns was calambur and another of aventurine … \u201c<\/p>\n\n\n\n