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Wyartite CaU 5+ (UO 2) 2 (CO 3)O 4 (OH) ·7H 2 O is a uranium bearing mineral named after Jean Wyart (1902–1992), mineralogist at the Sorbonne, Paris.It has greenish-black, black, or violet-black, translucent to opaque orthorhombic crystals. [4]
The luster varies widely: from diamond to glassy, some slightly transparent or opaque varieties have a greasy or waxy luster. There is no pleochroism. The actual measured density is from 6.1 to 6.6 g/cm 3, the calculated one is 6.76 g/cm 3. Eulytine typically forms modified tetrahedral crystals with tristetrahedral shapes (often with a dominant ...
An opaque object is neither transparent (allowing all light to pass through) nor translucent (allowing some light to pass through). When light strikes an interface between two substances, in general, some may be reflected, some absorbed, some scattered, and the rest transmitted (also see refraction ).
A formula from a 1968 US patent consisted of water and a transparent, translucent, or opaque mix of mineral oil, paraffin wax, and carbon tetrachloride. [3] p. 2, line 30 The clear water or mineral oil can optionally be coloured with translucent dyes. Common wax has a density much lower than that of water and would float on top at any temperature.
The opacity of a microbial colony can be described as transparent, translucent, or opaque. Staphylococci are usually opaque, [ 1 ] : 167–8 while many Streptococcus species are translucent. [ 4 ] : 188 The overall shape of the colony may be characterized as circular, irregular, or punctiform (like pinpoints).
A Peruvian opal (also called blue opal) is a semi-opaque to opaque blue-green stone found in Peru, which is often cut to include the matrix in the more opaque stones. It does not display a play of color. Blue opal also comes from Oregon and Idaho in the Owyhee region, as well as from Nevada around the Virgin Valley. [17] Opal is also formed by ...
Moreover, the size of the grain boundaries scales directly with particle size. Thus, a reduction of the original particle size well below the wavelength of visible light (about 1/15 of the light wavelength, or roughly 600 nm / 15 = 40 nm) eliminates much of the light scattering, resulting in a translucent or even transparent material.
The opaque projector, or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. The episcope must be distinguished from the diascope , which is a projector used for projecting images of transparent objects (such as films or slides), and from the epidiascope , which is capable of projecting ...