You'll be understanding if, when you obtain a copy of the book, you turn to the Santa Tereza chrysoberyl
(page 106: Keith Proctor collection), Morro Velho gold (page 150: Alvaro Lucio collection), Lavra Caba Saco rutile (page 288: Luiz Menezes collection), Brumado dolomite (page 317: Julio Landmann collection), Ouro Preto crocoite (page 331: Alvaro Lucio collection), Sapo mine fluorapatite (page 347: Jim and Gail Spann collection), Malacacheta autunite (page 357: Luiz Menezes collection), or nearly any one of the stunning specimens of topaz, elbaite, beryl, euclase, etc.
and sillimanite (fibrolite) are particularly prized for their sharp 'eyes', especially when such cabochons also show high transparency.
de), which was holding court at the Pueblo/River-park Inn show, had excellent thumbnail-size V-twins and sixling twins of alexandrite chrysoberyl
from Lake Manyara, Arusha, Tanzania.
A remarkable number of other species have also been identified as inclusions in Zambian emeralds, including actinolite, tremolite, chlorite, dravite, apatite-(CaF), magnetite, hematite, quartz, fluorite, magnesite, siderite, dolomite, calcite, ankerite, niobium-rich rutile, pyrite, talc, zircon, barite, albite, lepidocrocite, glauconite, quartz, chrysoberyl
, margarite, muscovite, biotite, brookite, tourmaline and chrysotile (Huong, 2008; Zwaan et al.
The yellow-green, partially gemmy single crystals of chrysoberyl
reach only a few millimeters, but they perch smartly on faces of tapered ('Tessin"-habit) smoky quartz crystals.
The next shelf down in the showcase was filled with bright, gemmy, yellow to yellow-green groups of chrysoberyl
crystals from a pocket opened in April 2008 in a pegmatite at Ambatondrazaka: the thumbnail and miniature-size specimens are groups of twinned chrysoberyl
crystals with individuals to about 3.
Beekman (1992) divides the subject matter covered in the third book as follows: seven chapters on metals, including gold, silver and iron; 13 chapters on minerals, including realgar, orpiment, alum, pyrite, marcasite, gypsum, quartz, alabaster and asbestos; seven chapters on gemstones, including diamonds, rubies, emeralds, sapphires, chrysoberyl
, opal and agates; a remarkable 29 chapers on the unremarkable subject of concretions; and a miscellany of chapters on "curiosities," including stones with unusual shapes, porcelain, salt, amber, glass, etc.
Rhodesian alexandrite sixling chrysoberyl
twins an inch across would come a little more expensive--maybe as much as $2.
corundum, beryl, chrysoberyl
, tourmaline, garnets, quartz, opal, jade, "The Natural Glasses" and marble.
He initiated, or was active in, various specimen mining projects in Vera Cruz, Guerrero, and Sonora, Mexico; the Otjua mine in Namibia; chrysoberyl
, topaz and brazilianite localities in Brazil; the De Maria gold mine in California; the Blanchard mine in New Mexico; the Bunker Hill mine in Idaho; the Block D mine area in Arusha, Tanzania; and a new epidote locality in Kenya which he worked with the legendary African explorer Campbell Bridges.
Further, Herr Hintze had a few nice, loose, thumbnail-size specimens of chrysoberyl
(variety alexandrite) from Lake Manyara, Tanzania: flattened, contact-twinned, gray-green crystals, not gemmy but sharp and lustrous, some with an easily visible color-change (i.
New Era Gems of Grass Valley, California had a fine array of loose alexandrite chrysoberyl
crystals from Lake Manyara in Tanzania.