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 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: ...
shelly fracture Synonym of conchoidal fracture. shield volcano A low, broad, gently sloping, ...
It has a conchoidal fracture and delicate tenacity therefore it is sensitive to pressure and heat. It is so green that the famous roman scholar 'Plini' called it "greener than green.
It has no cleavage and demonstrates the uneven or conchoidal fracture which is typical of glassy, amorphous materials. This type of fracture displays a series of rounded, concentric rings radiating away from the point of impact.
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.
It has an imperfect octahedral cleavage and a conchoidal fracture. Its hardness is 8, its specific gravity is 3.5-4.1 and it is transparent to opaque with a vitreous to dull lustre.
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.
The rather fragile vitreous to resinous crystals exhibit no plane of cleavage, a conchoidal fracture, a hardness of 6 - 7 and a varying specific gravity of 3.32 - 3.47. Intumescence accompanies fusion at 3 to produce a greenish or brownish glass.
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: Fracture, Crystal, Concho, Mineral, Crystals
  
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