conchoidal


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con·choi·dal

(kon-koy'dăl),
Shaped like a shell; having alternate convexities and concavities on the surface.
[concha + G. eidos, appearance]

conchoidal

(kŏng-koy′dăl) [″ + eidos, form, shape]
Shell-shaped.

con·choi·dal

(kŏn-koydăl)
Shaped like a shell; having alternate convexities and concavities on the surface.
[concha + G. eidos, appearance]
References in periodicals archive ?
Talvez a diferenca entre os achados no sitio Corpus e outros achados em sitios Guarani em regioes meridionais brasileiras resida no fato destas apresentarem menor disponibilidade de grandes afloramentos de rochas de fratura conchoidal.
Fractured conchoidal surfaces are common on the silcrete outcrop and on displaced silcrete blocks downslope from the outcrop.
The glass shards are colourless, irregular to rounded in shape, crystalline in nature and exhibits conchoidal to irregular fractures within them (Fig 8 ).
5YR 6/6) fired light gray (10YR 7/2) on exterior, with a smooth to conchoidal break; a few, medium to very large, rounded to angular, spherical, creamy yellow lime bits have spalled; rare medium to very large, angular platy gold mica visible on surfaces; rare, medium to large, spherical rounded, hollow white inclusions.
A ripper cutter attacks the rock at a shallow angle with a broad, slow-moving bit which causes the rock to spall ahead of the bit, giving a conchoidal fracture surface.
This causes the rock to spall ahead of the bit, breaking to the surface with a conchoidal fracture.
There were only traces of conchoidal fractures and associated patterns, as in glass.
presence of usewear, retouch, and conchoidal fracture) rather than an awareness of the way glass artefacts were produced and used, which has most likely resulted in some artefacts being overlooked.
101] and [100], There are two cleavage directions, parallel to {010} and {100}, but they are rarely seen; the common fracture surface is conchoidal.
A conchoidal type of fracture is observed when glass breaks to give irregularly curved and usually striated surfaces.
The typical clay lithology of the Porters Creek consists of medium to dark gray clay which breaks with a conchoidal fracture.