conchoidal वाक्य
उदाहरण वाक्य
मोबाइल
- Removed flakes exhibit features characteristic of conchoidal fracturing, including striking platforms, bulbs of force, and occasionally eraillures ( small secondary flakes detached from the flake's bulb of force ).
- This results in conchoidal fractures, a characteristic of all minerals with no bulbs of force, and occasionally eraillures, which are small secondary flakes detached from the flake's bulb of force.
- These cores were river pebbles, or rocks similar to them, that had been struck by a spherical hammerstone to cause conchoidal fractures removing flakes from one surface, creating an edge and often a sharp tip.
- Conchoidal fractures often result in a curved breakage surface that resembles the rippling, gradual curves of a mussel shell; the word " conchoid " is derived from the word for this animal ( Greek " konche " ).
- They were all made from blades or from microblades ( nearly always of flint ), using the microburin technique ( which implies that it is not possible to conserve the remains of the heel or the conchoidal flakes from the blank ).
- It was apparently free from alteration, had specific gravity of 4.28 ( taken on a very pure fragment ), had a bright green chatoyancy at certain angles, and was like glass in its broad obsidian-like conchoidal fracture.
- They are transparent and glassy when fresh, albeit with a noticeably subdued'subvitreous'lustre due to the low refractive index, but readily alter to become waxy / greasy and then dull and opaque; they are brittle and break with a conchoidal fracture.
- In the course of his investigations, Nicomedes created the Pappus wrote : " Nicomedes trisected any rectilinear angle by means of the conchoidal curves, the construction, order and properties of which he handed down, being himself the discoverer of their peculiar character . ".
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