This produces microscopic conchoidal fractures as the abrasive rolls about between the two surfaces and removes material from both.
22.
It is brittle, with distinct { 100 } and { 001 } cleavages, and a conchoidal fracture.
23.
Specimens are known to have been made of flint, chert, jasper, chalcedony and other stone of conchoidal fracture.
24.
Evidence of human modification of the bones including cut marks, conchoidal impact, scars and burning, is consistently present.
25.
The eraillure flake is a chip removed through contact of a dominant force wave that creates the conchoidal flake and inferior waves.
26.
This mineral ranks a 5 on Mohs Scale of Hardness, though it is considered brittle, exhibiting conchoidal fracture when broken.
27.
The characteristics of bipolar reduction are different from that occurring in conchoidal fracture and are therefore often misinterpreted by archaeologists and lithic experts.
28.
"' Pharmacosiderite "'is a hydrated vitreous and resinous, and it has conchoidal, brittle and sectile fracture.
29.
"' Samsonite "'is a silver manganese antimony sulfosalt mineral with formula cleavage and a brittle to conchoidal fracture.
30.
The classic example is conchoidal fracture, like that of quartz; rounded surfaces are created, which are marked by smooth curved lines.
