-
conchoidal fracture is a
break or
fracture of a
brittle material that does not
follow any
natural planes of separation. Mindat.org
defines conchoidal...
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Knapping is the
shaping of flint, chert, obsidian, or
other conchoidal fracturing stone through the
process of
lithic reduction to
manufacture stone tools...
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fractures are
recognized in mineralogy:
conchoidal, earthy, hackly,
splintery (or fibrous), and
uneven factures.
Conchoidal fracture breakage that resembles...
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chrysoprase has a
hardness of 6 to 7 on the Mohs
hardness scale and a
conchoidal fracture like flint. The best
known sources of
chrysoprase are Indonesia...
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other naturally occurring rocks,
obsidian breaks with a
characteristic conchoidal fracture. It was also
polished to
create early mirrors.
Modern archaeologists...
- isometric-hexoctahedral class. It has very poor
cleavage and is
brittle to
conchoidal fracture. It is
quite soft, with a Mohs
hardness of 1.5 to 2, and it has...
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pearly luster.
Charoite is
strictly m****ive in nature, and
fractures are
conchoidal. It has an
unusual swirling,
fibrous appearance,
sometimes chatoyant,...
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producing stone tools. As
these materials lack
natural planes of separation,
conchoidal fractures occur when they are
struck with
sufficient force; for these...
- with
conchoidal fractures; Double-faceted, a
variety of multifaceted,
prepared platform, also
characteristically flat and ****ociated with
conchoidal fractures;...
- twinned. It has no true cleavage, but
shows an
octahedral parting and a
conchoidal fracture. Its
hardness is 8, its
specific gravity is 3.5–4.1, and it is...
