 | | 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...watercolor by Valter Fogato Title Page Photos Quartz crystal with hematite from Mangatobangy, IO cm |  | | Book | | Litchfield County, where good crystals were taken from quartz veins in a variety of metamorphic, plutonic and...Litchfield, where a mass of white quartz on a ridge had once been mined for quartz, and large ilmenite masses...ilmenite crystals to 7 .5 cm in matrix of massive quartz from these dumps-adding that, in his judgment,...Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...major associations of Swiss hematite iron roses are quartz, ortboclase, albite, rutile, and zeolites (especially |  | | Book (edition) | | gemstone. Good examples are Fire Opal and Rose Quartz. ¢ Transparent gems allow transmitted light to... Blueberry Quartz Blue Diamond Blue Fire Opal Blue Green Tourmaline Blue Moon Quartz Blue Sapphire...Danburite Diamond Goshenite Petalite White Quartz White Sapphire White Topaz White Zircon Other...Calcite, Howlite, and White Kunzite. Phantom Quartz, Phenakite Green Gems Amazonite Chrysoprase...Green Opal, Hiddenite, Idocrase, Mali Garnet, Olive Quartz and Prehnite. Multicoloured Gems yy Alexandrite |  | | Journal (issue) | | from Brazil, 8.51 ct Sri Lankan spinel, 13.00 ct Madagascar sphene; (bottom row)— 9.05 ct Sri Lankan “padparadscha”...mastering the market. Looked at The New York diamond district has long been the center of diamond distribution...Cook (right) presents a poster on golden rutilated quartz from Bahia, Brazil. Near right: Designer Michael...emerged from sources in Myanmar, Vietnam, and Madagascar. The greater popularity of colored gems has forced...their own right. Recent discoveries in southern Madagascar may provide additional supply. Relatively unknown |  | | Journal (issue) | | horn as an amber imitation • Fake inclusions in quartz • Dyed cultured pearls fading on exposure to heat... closely packed aggregate of cemented, angular quartz fragments. This quartzite and other sedimentary...overlying Mazatzal Formation. Quartz deposition (colorless and smoky quartz, as well as amethyst) is thought...solutions. This evidence includes not only the quartz mineralization, but also the occurrence of fine-grained...or absent (figure 7). This habit is common for quartz crystals Figure 7. Amethyst crystals from the |
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