 | | Journal (issue) |
| pure jadeite (J in As shown in Table I, the whole-rock Table I) to omphacitic jadeite (OJ) to jadeitic...Composition of black jadeite. wt.% Analysis of rock 1 Electronmicroprobe analyses ofjadeite grains...100.687 100.938 JO I OJ JO J OJ JO Notes: Rock analysis (1) by the National Research Center of...distinguished: 1. Brown inclusions may be on particular crystal faces of the jadeite grains or dispersed at random...an orderly way in the direction of a particular crystal surface. Figure 8: Jadeite grains with black dust-like |
 | | Journal (issue) |
| Bacher; Reinhold Bacher photo. Fluorapatite, 3.3-cm crystal, from the Pulsifer quarry, Maine. Collected by...own favorite experiences is gazing raptly into a crystal pocket just after it has been opened, and all the...classic locality for spectacularly large apophyllite crystal clusters, which still rank as some of the largest...cleaned off the thaumasite to expose the entire crystal. It is free of damage thanks to the protective... Eureka Supplement 5 THE THRILL Wulfenite crystal cluster, 30 cm across, collected in the Glove mine |
 | | Journal (issue) |
| peaks indicate that the impurities are in the crystal structure. The chemical analyses for the orange...four channels may radiate from an unidentified crystal (Figure 2). © Gemmological Association and Gem...the last phase all was covered by colourless rock crystal so this quartz-tourmaline stone is a sort of...located 31.5 km south of the city of Wroclaw in the province of Dolny Slask (Lower southwest Poland (Figure...quarry originally established for the extraction of rock aggregate for road construction purposes (Figure |
 | | Journal (issue) |
| deposit in in aa calc-silicate calc-silicate rock. rock. Dissolution Dissolution ofof marble marble by...hessonitehessonitebearing bearing calc-silicate calc-silicate rock rock was was formed formed during during the the granulite...deposit in in aa calc-silicate calc-silicate rock. rock. ©©Gemmological Gemmological Association Associationand...calc-silicate rock, quartzite, pelitic gneiss, khondalite (a garnet-sillimanite schistose rock) and metamorphic...prominent. The corundums invariably show worn crystal faces or rounded surfaces and the quartz pebbles |
 | | Book (edition) |
| these properties may vary with direction in the crystal; for example, the mineral may be harder on one...clearly defined. Above all, minerals have distinct crystal structures: the atoms which make up a mineral are...threedimensional network. No matter where we sample the crystal, the arrangement is the same. This is basic to...each other's place without greatly deforming the crystal structure, the minerals may form what is known..., be chemically identical) but have different crystal structures; that is, the atoms may be arranged |
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| in crystallised quartz varieties such as reck crystaL smoky quartz, amethyst, etc. beim Erkennen und...very esthetic, increasing the value of the hast crystal appreciably. The inclusions also provide us with...illumination, the prism planes of the original crystal can be seen. 22 carry important information...reconstruct the formation and history of the hast crystal, inferring among others the prevailing conditions...conditions of pressure and temperature, while the crystal formed. This obviously also applies to quartz, whose |
 | | Book |
| vugs of crystalline talc. Easily the best extant crystal, a doubly terminated floater found in a talc vug...2013). MALAWI Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series...Shelley Lambert extracted excellent loose ilmenite crystal clusters from a calcite vein-dike digging site...Chamberlain, 1982; Joyce, 2006a). Some of the ilmenite crystal faces are partly overgrown by a brown coating which...and is by far the largest known single ilmenite crystal from any locality worldwide. The crystals are blue-black |
Selvino, Bergamo Province, Lombardy, Italy