Conchoidal Fracture: A smooth, shell-like, curved fracture that is conically shaped
Earthy Fracture: Occurs in soft, loosely bound minerals
Even Fracture: Leaves a smooth, flat surface ...
CONCHOIDAL. Shell-like fracture of any mineral.
CONCRETIONS. Mechanical aggregation, or chemical union of particles of mineral forming balls or irregularly shaped nodules in strata of different material.
conchoidal A type of fracture that is non-diamond such as glass. Resembles a shell-like smooth surface.
core samples One of the diamond prospecting methods, a precursor to mining.
Concho: See Concha.
Condition, Excellent: A piece of jewelry in Excellent Condition will show reasonable evidence of wear, and have a fine patina.
Conchoidal fracture is the most common, and is found in corundum, beryls, all the quartzes, opals, and both natural and man-made glasses. Turquoise and coral are commonly simulated by glass.... So: ...
Conchoidal.
Source
United States, Hawaii, Japan, Iceland, Java, Hungary, Russia, Ecuador, Italy, Mexico and Scotland.
Conchoidal
A type of fracture happen on amorphous substances, like shipped glass, shell ect.
Cone cabochon
Similar dome cut, difference the crown surface is cut in a straight angle and rounded on the top only.
Concho
Round or oval metal pieces that are often embossed with western designs. Conchos are popular in creating costume jewelry with a western motif, as well as hat and belt decorations.
Cowrie shell ...
Conchoidal..(fracture), A breakage which leaves a conchoidal shell shaped surface.
15mm wide conchos
One pair available
Sparkling Crystal, Rose Quartz
and Silver Dangle Earrings ...
Now commonly called a "Concho Belt." ConchoSee Concha. CoralCorallium rubrum, the red or precious coral was introduced to the Indians by the Spanish.
shelly fracture Synonym of conchoidal fracture. shield volcano A low, broad, gently sloping, ...
Fracture: conchoidal
Fracture lustre: oily
Luster: vitreous to oily
Diaphaneity: translucent to transparent
Colors: yellow-green bright green olive green brownish-green
Phenomena: asterism and chatoyancy extremely rare
Specific gravity: 3.
Examples of distinctive types of fracture are 'conchoidal,' 'irregular,' and 'hackly' fracture.
Fracture: conchoidal
Toughness: good
Specific Gravity: varies with composition; most gem varieties in the range 3.58-3.61. Zn-rich spinel (rare) can be as high as 4.40. Synthetic spinel has an S.G. of 3.63-3.64.
R.I.: about 1.
5, has very poor cleavage, conchoidal fracture, is strongly piezoelectric, and has good toughness. Of the numerous species that make up the tourmaline group it is mostly the elbaite or liddicoatite species that interest gem and mineral collectors.
Very pure gallium has a stunning silvery color and its solid metal fractures conchoidally like glass. Gallium metal expands by 3.
The transparent green olivine as peridot is also known as has a conchoidal fracture. It is basically magnesium iron silicate which occurs in other glittering colors like lime, yellowish green, olive green or medium dark green.
A distinctive, common fracture is called conchoidal, which is a shell-like break. This break is seen in glass, quartz, opal, peridot, and amber, to name a few. Other possible fractures include uneven, splintery, granular, or subconchoidal.
Crystal system: hexagonal
Fracture: Conchoidal
Luster: Vitreous to resinous
Folklore, Legend, and Healing Properties: ...
Conchoidal Fracture - Shell-shaped breakage pattern, as in glass or quartz.
Crested - Tabular crystals in groups, which form ridges.
Cruciform - Having the shape of a cross (Staurolite) ...
Crystal System: Monoclinic
Cleavage: Perfect basal
Fracture: Splintery or conchoidal
Magnetism: None
Reaction with HCl: Unknown ...
Fracture - A fracture is a crack against the flat planes or irregular surfaces of a gemstone. A fracture can be characterized as conchoidal (shell- like), uneven, smooth, fibrous, splintery or grainy.
External fractures often take characteristic forms that are helpful when identifying minerals. Adjectives used to describe fracture include conchoidal, splintery, even, uneven, irregular, and granular.
If a fracture is irregular and results in a rough surface, it is hackly. If the irregular fracture propagates as a single surface resulting in a shiny surface as in glass, the fracture is said to be conchoidal.
Summer 1977, Conchoidal fracture in diamonds, p. 309, 2pp.
Fall 1977, Cubic Zirconia; moss patched on the surface of radium treated diamonds, p. 345, 3pp.
Winter 1977, More on Cubic Zirconia, p. 361, 3pp.
 See also: Crystal, Fracture, Color, Mineral, Crystals
  
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