{"id":2044142,"date":"2006-08-04T10:07:12","date_gmt":"2006-08-04T10:07:12","guid":{"rendered":"http:\/\/romfilatelia.ro\/romagazin\/en\/product\/minerals\/"},"modified":"2021-03-24T09:14:42","modified_gmt":"2021-03-24T09:14:42","slug":"minerals","status":"publish","type":"product","link":"https:\/\/magazin.romfilatelia.ro\/en\/product\/minerals\/","title":{"rendered":"MINERALS"},"content":{"rendered":"<p><a href=\"http:\/\/romfilatelia.ro\/wp-content\/uploads\/2006\/08\/minerale.jpg\"><img decoding=\"async\" class=\"size-medium wp-image-2005018 alignleft\" src=\"http:\/\/romfilatelia.ro\/wp-content\/uploads\/2006\/08\/minerale-300x152.jpg\" alt=\"minerale\" width=\"300\" height=\"152\" \/><\/a>Romfilatelia on the occasion of the celebration of 100 years since the foundation of the Geological Institute of Romania, introduces into circulation the postage stamps issue MINERALS.<br \/>\nRomfilatelia, the company specialized in issuing and trading Romanian postage stamps, on the occasion of the<br \/>\ncelebration of 100 years since the foundation of the Geological Institute of Romania, introduces into circulation the postage stamps issue MINERALS.<\/p>\n<p>The mineral is a solid body, with a definite chemical<br \/>\ncomposition, which can be found in nature in crystalline<br \/>\nor amorphous form. Minerals form the rocks and ores, being represented by various chemical combinations and, rarely, by native elements.<br \/>\nOver 4000 minerals are known, among which silicates represent around 34%, oxides and hydroxides approx. 25%, and sulphides approx. 20%.<br \/>\nThe minerals presented on the postage stamps of the<br \/>\nphilatelic issue are the following: agate, amethyst, blende, quartz, fluorite, and stibnite.<\/p>\n<p>Fluorite (CaF2) \u2013 fluorum in Latin. The crystallization<br \/>\nsystem is cubical. Very seldom it can be colourless or<br \/>\ncoloured in honey yellow, green, violet, blue, having<br \/>\nsometimes one colour inside and another colour outside. It has a glassy glare. It is thermoluminescent and fluorescent. It is used as a fusing agent in metallurgy, in optics, in the chemical industry, as well as in the ceramics industry. In Romania, it can be found in Baia Mare, M\u0103cin, Tulghe\u015f, Brad.<br \/>\nIt is illustrated on the postage stamp which has the face value of RON 0.30.<\/p>\n<p>Quartz (SiO2) \u2013 The crystallization system is<br \/>\ntrigonal and has a great number of various forms.<br \/>\nBy its aspect and particularly by its structure and colour, we have phanerocrystalline varieties: (rock crystal \u2013 colourless,<br \/>\ntransparent, citrine \u2013 yellowish, morion \u2013 dark smoky colour, amethyst \u2013 violet, tiger eye \u2013 brownish yellow); cryptocrystalline (chalcedonia \u2013 variety of fibrous, superfine quartz, with various colours: onyx, sardonyx) and amorphous (opal \u2013 hydrated form of silica). Besides the feldspars, it is the most wide-spread mineral in the earth shell. It is used as a semiprecious stone, in the optics, computers, glass and abrasives industry.<br \/>\nIt is illustrated on the postage stamp which has the face value of RON 0.50.<br \/>\nAgate (SiO2), whose name comes from the river<br \/>\nAchates of Sicily, is a variety of chalcedony with regular<br \/>\nconcentric areas, nicely coloured in various colours. It is used as a semiprecious stone. In Romania it can be found in Maramure\u015f and Apuseni Mountains.<br \/>\nIt is illustrated on the postage stamp which has the face value of RON 1.00.<\/p>\n<p>Blende (ZnS) or Sphalerite (sfaleros in Greek), is a<br \/>\nnatural zinc sulphide, of yellow, green, red, brown or black colour. The crystallization system is cubical. It is used in the metallurgic industry. Deposits in Romania: Baia Mare, Apuseni Mountains, Moldova Nou\u0103.<br \/>\nIt is illustrated on the postage stamp which has the face value of RON 1.20.<\/p>\n<p>Amethyst (SiO2), amethystos in Greek, is a variety of quartz, coloured in violet, with bi-pyramidal forms, without prism sides or prismatic crystals, ending directly with<br \/>\nthe rhombohedron. It is used as a semiprecious stone. In<br \/>\nour country, it can be found in Maramures.<br \/>\nIt is illustrated on the postage stamp which has the face value of RON 1.50.<\/p>\n<p>Stibnite (Sb2S3) or Antimonite (stibium in Latin), has a rhombic crystallization system. Crystals are always<br \/>\nprismatic and oblong, usually with vertical striae. Often<br \/>\nthey have the form of radially arranged sheaves. The colour<br \/>\nis blueish gray or even grayish black, with metallic gloss.<br \/>\nIt is the most important ore, out of which the antimony<br \/>\nis extracted, which is used for antifriction alloys, printing,<br \/>\nin the rubber and glass industry, in pharmaceutical<br \/>\npreparations, metal fitting products. In Romania, it can<br \/>\nbe found in Baia Mare.<br \/>\nIt is illustrated on the postage stamp which has the face value of RON 2.20.<\/p>\n<p>The philatelic issue was prepared with the assistance from the specialists of the Geological Institute of Romania.<\/p>\n<p>Issue date: 2006-08-04<\/p>\n<p><a>COMPLETE TECHNICAL CHARACTERISTICS<\/a><\/p>\n<p>To place your orders, please contact Romfilatelia, the specialized company in philatelic trade, at the following coordinates:<\/p>\n<p>Address: 28 Fabrica de Chibrituri, 050183, Bucharest, ROMANIA<br \/>\nPhone.: + 40 21 336 93 92\/+ 40 21 336.93.46<br \/>\nFax: + 40 21 337 24 48<br \/>\nE-mail: office@romfilatelia.ro<br \/>\nWeb site: www.romfilatelia.ro<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Romfilatelia on the occasion of the celebration of 100 years since the foundation of the Geological Institute of Romania, introduces [&hellip;]<\/p>\n","protected":false},"featured_media":2044143,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"product_cat":[2538],"product_tag":[],"class_list":{"0":"post-2044142","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-2006-annual-collections","7":"desktop-align-left","8":"tablet-align-left","9":"mobile-align-left","11":"first","12":"instock","13":"shipping-taxable","14":"product-type-grouped"},"_links":{"self":[{"href":"https:\/\/magazin.romfilatelia.ro\/en\/wp-json\/wp\/v2\/product\/2044142"}],"collection":[{"href":"https:\/\/magazin.romfilatelia.ro\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/magazin.romfilatelia.ro\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/magazin.romfilatelia.ro\/en\/wp-json\/wp\/v2\/media\/2044143"}],"wp:attachment":[{"href":"https:\/\/magazin.romfilatelia.ro\/en\/wp-json\/wp\/v2\/media?parent=2044142"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/magazin.romfilatelia.ro\/en\/wp-json\/wp\/v2\/product_cat?post=2044142"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/magazin.romfilatelia.ro\/en\/wp-json\/wp\/v2\/product_tag?post=2044142"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}