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Vitreous minerals have the lustre of glass. (The term is derived from the Latin for glass, vitrum.) This type of lustre is one of the most commonly seen, [9] and occurs in transparent or translucent minerals with relatively low refractive indices. [2] Common examples include calcite, quartz, topaz, beryl, tourmaline and fluorite, among others.
In general opaque glass can devit easily as crystals are present in the glass to give its opaque appearance and thus the higher the chance it might devit. Techniques for avoiding devitrification include cleaning the glass surfaces of dust or unwanted residue, and allowing rapid cooling once the piece reaches the desired temperature, until the ...
A number of murrine may be scattered, more or less randomly, on a marver (steel table) and then picked up on the surface of a partially-blown glass bubble. Further blowing, heating, and shaping on the marver will incorporate the murrine completely into the bubble, creating a random arrangement of murrine in the vessel or sculpture being blown.
An object may be not transparent either because it reflects the incoming light or because it absorbs the incoming light. Almost all solids reflect a part and absorb a part of the incoming light. When light falls onto a block of metal , it encounters atoms that are tightly packed in a regular lattice and a " sea of electrons " moving randomly ...
Blaschka glass model of Asarum canadense. The Ware Collection of Blaschka Glass Models of Plants (or simply the Glass Flowers) is a collection of highly realistic glass botanical models at the Harvard Museum of Natural History in Cambridge, Massachusetts.
A modern-day decorative glass bell jar containing a succulent. Purely decorative bell jars were commonly used in the Victorian period to display and serve as transparent dust covers and display cases for a wide variety of items, including clocks, taxidermy, shells, and wax flowers and fruit.
The transparent color should be chosen carefully, to avoid items that just happen to be the same color vanishing. Even this limited form of transparency has patchy implementation, though most popular web browsers are capable of displaying transparent GIF images.
White Lilacs in a Glass Vase (German: Der Fliederstrauß; French: Lilas blanc dans un vase de verre) is an 1882 oil-on-canvas painting by Édouard Manet, now in the Alte Nationalgalerie, in Berlin. Showing cuttings of white lilacs in a glass vase, it is one of a series of flower still lifes by the painter.