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Rhodizite-Londonite from the Antsongombato Pegmatite, Central Madagascar - Describes the history, geology, mining, and gemological characteristics of gem-quality rhodizite-londonite from its only known source
Gems and gemology , 2002
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Pezzattaite from Ambatovita, Madagascar: A Now Gem Mineral - A look at the history, geology, composition, and properties of this new cesium-rich member of the beryl group
Gems and gemology , 2003
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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FEATURE ARTICLES - An Update on "Paraiba" Tourmaline from Brazil - Mining activities for these vivid cuprian elbaites are expanding at the original deposit in Paraiba State, and similar tourmalines are also being mined in adjacent Rio Grande do Norte State
Gems and gemology , 2001
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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FEATURE ARTICLES - Spessartine Garnet from Ramona, San Diego County, California - This in-depth report looks at the history, geology, and gemology of the bright orange garnets from this century-old pegmatite locality
Gems and gemology , 2001
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Liddicoatite Tourmaline from Anjanabonoina, Madagascar - Explores the world's primary source of this remarkable calcium-rich lithium tourmaline, named in honor of Richard T. Liddicoat
Gems and gemology , 2002
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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FEATURE ARTICLES - Ruby and Sapphire from Jegdalek, Afghanistan - Explore the mining and gemology of gem corundum from this historic source
Gems and gemology , 2000
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Benitoite from the New Idria District, San Benito County, California
Gems and gemology , 1997
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Mt. Mica: A Renaissance in Maine's Gem Tourmaline Production - This historic deposit is once again producing fine tourmalines, with both the mining area and the gems examined in this report
Gems and gemology , 2005
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Emeralds from the Kafubu Area, Zambia - The geology, production, and gemological properties of emeralds from this, the second largest emerald-producing country in the world, are described
Gems and gemology , 2005
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Yellow Mn-rich Tourmaline from the Canary Mining Area, Zambia - Explores the vivid "canary" yellow elbaite from the Lundazi District of eastern Zambia, the most important source of this tourmaline
Gems and gemology , 2007
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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RAPID COMMUNICATIONS - Yellowish Green Diopside and Tremolite from Merelani, Tanzania
Gems and gemology , 2007
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Separating Natural and Synthetic Rubies on the Basis of Trace-Element Chemistry
Gems and gemology , 1998
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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EDITORIAL - New Technologies Face Off with New Realities
Gems and gemology , 2009
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Rubies and Sapphires from Winza, Central Tanzania - Describes the mining and geology of this new source of untreated rubies, and characterizes the gem corundum produced there, which arrived on the market in early 2008
Gems and gemology , 2008
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft
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Copper-Bearing (Paraíba-type) Tourmaline from Mozambique - The geology, mining, and properties are described for this tourmaline, which typically yields bright Paraíba-like blue-to-green hues on heat treatment
Gems and gemology , 2008
Enthalten in: Gems and gemology
OLC Kunst und Kunstwissenschaft