Research Results For 'Opal'

BRENDA VACCARO

Brenda Vaccaro is an American actress. She was born in 1939 at Brooklyn, New York. Brought up in Texas, she started acting in amateur theatre companies before attending the New York Neighbourhood Playhouse and had her New York stage debut in the play 'Everybody Loves Opal', for which she won a Theatre World Award. Her first film role was in the film 'Midnight Cowboy'. In 1981 she was applauded by women's groups for appearing in an advert for Playtex tampons.
Research Brenda Vaccaro

PHOSPHORIC ACID

Phosphoric acid can exist as a crystal or clear liquid. It is an oily, thick, colourless, and odourless liquid, or a thick, colourless, unstable crystalline solid. It is used in the manufacture of phosphates, such as salts, soaps, and detergents; fertilizers; yeasts; fire control agents; opal glass; electric lights; dental cements; waxes and polishes; gelatin; ethylbenzene, propylene, and cumene; and soft drinks. It is used as an acid catalyst, soil stabilizer, antioxidant in food, acidulant and flavour agent in jellies and preserves, bonding agent for refractory bricks, and petrol additive. It is also used in the rust proofing and polishing of metals, cotton dyeing, tile cleaning, extracting penicillin, hot stripping for aluminium and zinc substrates, ceramic binding, water treatment, process engraving, electro-polishing, coagulating of rubber latex, operating lithography and photoengraving operations, and pickling. It is used to manufacture the phosphoric acid electrolyte fuel cell system which has created the largest fuel cell built and has been used to treat lead poisoning.

Phosphoric acid is incompatible with strong caustics and most metals. It readily reacts with metals to form flammable hydrogen gas. The liquid can solidify at temperatures below 21 degrees C. It is corrosive to ferrous metals and alloys. It is soluble in alcohol and hot water. It can form three series of salts: primary phosphates, dibasic phosphates, and tribasic phosphates. It is deliquescent and hygroscopic. It is a chelating agent. It has a low vapour pressure at room temperature. Phosphoric acid is also known as orthophosphoric acid, metaphosphoric acid, and white phosphoric acid.
Research Phosphoric acid

AGATE

Agate is a semi-precious stone siliceous semi-pellucid compound mineral, consisting of bands or layers of various colours blended together, the base generally being chalcedony, and this mixed with variable proportions of jasper, amethyst, quartz, opal, heliotrope, and carnelian. The varying manner in which these materials are arranged causes the agate when polished to assume some characteristic appearances, and thus certain varieties are distinguished, as the ribbon agate, the fortification agate, the zone agate, the star agate, the moss agate, the clouded agate, etc. In Scotland they are cut and polished under the name of Scottish pebbles.
Research Agate

CACHOLONG

Cacholong or mother-of-pear opal and sometimes Kalmuck agate, is a variety of opal, usually grey in colour, milk white or bluish white, and resembling mother-of-pearl. It is banded with layers of different colours and is a most attractive ornamental stone.
Research Cacholong

CHLOROPAL

Chloropal is a massive mineral, greenish in colour, and opal-like in appearance. It is essentially a hydrous silicate of iron.
Research Chloropal

FIORITE

Fiorite, so called from Fiora, in Ischia, is a variety of opal having a pearly lustre, occurring in the cavities of volcanic tufa, in smooth and shining globular and botryoidal masses.
Research Fiorite

GEYSERITE

Geyserite is a loose hydrated form of silica, a variety of opal, deposited in concretionary cauliflower-like masses, around some hot springs and geysers.
Research Geyserite

GIRASOLE

Girasole (girasol) is a variety of opal which is usually milk white, bluish white, or sky blue in colour but in a bright light reflects a reddish colour. The brightest are found in Brazil and Siberia. The name is sometimes bestowed on the Asteria sapphire. One variety is known as the fire opal.
Research Girasole

HYALITE

Hyalite (Muller's glass) is a clear, glassy variety of opal, never opalescent though often faintly iridescent.
Research Hyalite

HYDROPHANE

Hydrophane is a porous, translucent opal, which on being placed in water becomes nearly transparent as the water is absorbed into the pores.
Research Hydrophane

	The Probert Encyclopaedia was designed, edited and programed by Matt and Leela Probert ©1993 - 2009 The Probert Encyclopaedia Southampton, United Kingdom