TWIN CRYSTALS - Two or more mineral crystals that have grown together in a symmetrical nature, usually nonparallel. Sometimes called twinned crystals.
Twin Crystals...Two or more crystals which have grown together in a symmetrical fashion.
Ultraviolet Light...Wavelengths of light shorter than visible violet light.
Ultrabasic rock.. Any plutonic igneous rock with very low silica content.
Also called twin crystals, these are two or more crystals joined together (when there are several they are generally called a cluster). The crystals may be of different sizes and shapes; what matters is their connection.
A twinning plane is the growth plane between two twin crystals. In this plane the twin crystals meet in mirror-image crystallographic orientation of their hardness directions.
sort of effect, this time due to the presence of hosts of small twin crystal layers that reflect light so as to produce a sort of moonlight-on-the-water appearance within the stone when the latter is properly cut, with the layers of twin crystals ...
Titanite with feldspar and epidote (6.3 x x 2.2 x 1.9 cm), from Capelinha, Minas Gerais Province, Brazil. This specimen, from the Martin Zinn Collection, features twin crystals with great luster. Price: $3,200. (Photo: John McLean) ...
The word chyrso is derived from the word chrysos that means "golden" while beryl word from berullos that means gem crystal. Thus, when we join both words we get Chrysoberyl. Similar to its names it possesses twin crystals within its structure.
 See also: Crystals, Stone, Crystal, Color, Mineral
  
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