Precious Stones Considered in Their Scietific and Artistic Relations: With a Catalogue of the Townshend Collection of Gems in the South Kensington MuseumChapman and Hall, limited, 1883 - 111 páginas |
Otras ediciones - Ver todas
Precious Stones Considered in Their Scientific and Artistic Relations - With ... Arthur Herbert Church Sin vista previa disponible - 2009 |
Términos y frases comunes
A. H. Church Almandine alumina aluminium Apophyllite aquamarine artistic aurora red axinite beauty beryl blue bordered Brazil brilliant brilliant-cut brown brownish cabochon carat carbuncles cat's-eye Ceylon chatoyancy chromium chrysoberyl cinnamon-stone claw mount colourless contains coronet mount corundum cut en cabochon Cymophane diam diamond dichroiscope emerald enamel engraved Essonite faceted felspar garnet gem-stones gems gold grains gray greenish hæmatite hardness Hope catalogue indigo Iolite iron oxide jargoon jewellery jewels Lapis-lazuli light lime lustre magnesia mineral moonstone Museum nearly oblong opal opaque openwork mount optical oriental amethyst oval pale pearls peculiar peridot phenakite pink plain mount Plate pleiochroism precious stones prism prismatic purple Pyrites Quartz refractive rich rock crystal roses ruby sapphire set in silver Silica Silica Alumina specific gravity specimens spinel Spodumene step-cut Streeter surface thick tint topaz tourmaline TOWNSHEND COLLECTION translucent transparent turquoise varieties violet weight yellow yellowish Zircon
Pasajes populares
Página 17 - But a caution as to the necessity in all specific gravity experiments of getting rid of air-bubbles may not be out of place. To attain this end boiled water should be used, and if mechanical contrivances fail (a feather or sable pencil) then the liquid and stone should be placed under the receiver of an air-pump and the air exhausted. Details concerning the specific gravity of each kind of precious stone will be found in Chapter VII.