 | | Journal (article/letter/editorial) | | Liddicoatitic Tourmalines ANJANABONOINA DISTRICT, MADAGASCAR T he tourmaline database, like that of most other...description of liddicoatite from Anjanabonoina, Madagascar, as the calcium analogue of the well-known gem... and liddicoatite’s fundamental place in the tourmaline family appeared to be established. Here things...does indeed exist, perhaps just not at its type Madagascar locality. So, determining that a crystal is actually...actually fluor-liddicoatite. In their article on tourmaline nomenclature, Henry et al. (2011) suggest the |  | | Journal (article/letter/editorial) | | granitic pegmatites? Clues from hybrid pegmatites in Madagascar Robert F. Martin,1,* Caterina De Vito,2 and Federico...type. Elements of an explanation of the “NYF pegmatite-amazonite” connection emerged in a study of the...granitic pegmatite in Madagascar. The NYF assemblages there and at the Sakavalana and Anjahamiary pegmatites...close to 13‰, indicative of formation of the NYF-pegmatite-forming magma by the melting of crustal rocks... Plumbian K-feldspar also occurs in granitic pegmatite bodies formed by anatexis in the vicinity of a |  | | Report (issue) | | The Natural History Museum of Milan and its Madagascar Collection The Museo Civico di Storia Naturale... the museum began paleontologic fieldwork in Madagascar (upper Permian fauna and Jurassic and Cretaceous...fieldwork in Madagascar in 1996 in collaboration with other institu tions in Madagascar, Italy, and the...Pezzotta has spent a total of twenty nine months in Madagascar making geological-mineralogical surveys. In collaboration...a cross section of a tourmaline crystal from Anjanabonoina, from the tourmaline collection at the Kristallmuseum |  | | Journal (article/letter/editorial) | | ABSTRACT Pink, Mn-bearing “oxy-rossmanite” from a pegmatite in a quarry near Eibenstein an der Thaya, Lower...significant amounts of [4]B and [4]Al in an Al-rich tourmaline. The “oxy-rossmanite” from Eibenstein has the...hydroxyl groups are present in the Eibenstein tourmaline and that they are present at a lower concentration...is distinctly lower than for other Li-bearing tourmaline samples (970–1260 cm–2) with OH contents >3.0...irradiation of Mn2+. This is the first time a tourmaline is described that has a composition that falls |  | | Book (edition) | | 176 Lapis Lazuli 180 Moonstone 184 Paraiba Tourmaline 190 Peridot 198 Ratanakiri Zircon 204 ...(macrocrystalline), such as Amethyst, Sapphire and Tourmaline. Other gems have a crystal structure that is...always true, for example, the coveted Paraiba Tourmaline was only discovered in 1989. In an article in...less than $100 per carat, while a fine Paraiba Tourmaline can sell for over $30,000 per carat. That seems...colour is popular and it's rare, such as Paraiba Tourmaline or Padparadscha Sapphire, then you've got a gemstone |  | | Journal (issue) | | displaying asterism • Copper-bearing color-change tourmaline from Mozambique 252 pg. 249 Gem News International...almandine-spessartine from Afghanistan • Gem tourmaline from Congo • Dyed horn as an amber imitation...Copper-bearing Color-Change TOURMALINE from Mozambique Color-change tourmaline has been reported in G&G...submitted to the West Coast laboratory a color-change tourmaline that differed 250 LAB NOTES significantly...Raman analysis proved that this stone was indeed tourmaline (the Raman spectrum was consistent with rubellite |  | | Journal (issue) | | 2.59 ct ParaĂba tourmaline from Brazil, 8.51 ct Sri Lankan spinel, 13.00 ct Madagascar sphene; (bottom...Lankan “padparadscha” sapphire, 2.12 ct ParaĂba tourmaline from Brazil. Photo of stones © GIA and Harold...mastering the market. Looked at The New York diamond district has long been the center of diamond distribution...emerged from sources in Myanmar, Vietnam, and Madagascar. The greater popularity of colored gems has forced...ground in the past few years. Spinel, garnet, tourmaline, and a variety of lesser-known gems such as prehnite |  | | Book | | Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...of rutile (Weerth, 2004). Tonniq Valley, Skardu district, Gilgit-Baltistan [Northern Areas]. Beginning...testing to be hematite. Zagi [Zegi] Mountain, Warsak district, North West Frontier Province. Surface diggings...to 6 cm (2005: 120). Los Remedios mine, Taxco district, Taxco, Guerrero. Ilvaite occurs in the wallrock...manto deposits of polymetallic ores in the Taxco district, commonly as compact aggregates of crystals overgrown |
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Anjahamiary pegmatite, Tranomaro, Amboasary Sud District, Anosy, Madagascar