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Hyalite is a transparent form of opal with a glassy lustre. It may exhibit an internal play of colors if natural inclusions are present. It is also called Muller's glass, water opal, and jalite. Müller's glass is named after its discoverer, Franz-Joseph Müller von Reichenstein.
Coca-Cola followed by launching Tab Clear on December 14, 1992. [16] During the same year that Crystal Pepsi was released, several other manufacturers also released colorless versions of their existing products, such as colorless Palmolive dish soap, colorless Softsoap liquid soap, and colorless Rembrandt mouthwash. [18]
There are two broad classes of opal: precious and common. Precious opal displays play-of-color (iridescence); common opal does not. [6] Play-of-color is defined as "a pseudo chromatic optical effect resulting in flashes of colored light from certain minerals, as they are turned in white light."
Radiating spray of colorless wheatsheaf calcite crystals on matrix, from Iraí, Rio Grande do Sul, Brazil Rhombohedrons of calcite that appear almost as books of petals, piled up 3-dimensionally on the matrix, from Eastern Europe Sky blue, prismatic crystals of celestine from Majunga, Madagascar Pocket cavity of small chrysocolla stalactites ...
Opalite is a trade name for synthetic opalescent glass and various opal and moonstone simulants. Other names for this glass product include argenon, sea opal, opal moonstone, and other similar names. [1] [2] It is also used to promote impure varieties of variously colored common opal. [1]
Examples of iridescence include soap bubbles, feathers, butterfly wings and seashell nacre, and minerals such as opal. Pearlescence is a related effect where some or most of the reflected light is white. The term pearlescent is used to describe certain paint finishes, usually in the automotive industry, which actually produce iridescent effects.
Opalescence or play of color is an optical phenomenon associated with the mineraloid gemstone opal, [1] a hydrated silicon dioxide. [2] This effect appears as a milky, translucent glow that changes with the angle of light, often creating a soft, pearly sheen that can display various colors or hues.
Andamooka Opal, presented to Queen Elizabeth II, also known as the Queen's Opal; Flame Queen Opal; Galaxy Opal; Halley's Comet Opal, the world's largest uncut black opal; Olympic Australis Opal, reported to be the largest and most valuable gem opal ever found