natural hardness
1Natural History (Pliny) — Naturalis Historia, 1669 edition, title page. The title at the top reads: Volume I of the Natural History of Gaius Plinius Secundus. The Natural History (Latin: Naturalis Historia) is an encyclopedia published circa AD 77–79 by Pliny the… …
2Hardness of prominent abrasive materials — ▪ Table Hardness of prominent abrasive materials abrasive materials hardness Mohs scale (Mohs hardness) Vickers scale (Vickers hardness) Knoop scale (Knoop hardness) Natural abrasives industrial diamond 10 10,000 8,000 corundum 9 2,200 1,600… …
3Natural proof — In computational complexity theory, a natural proof is a certain kind of proof establishing that one complexity class differs from another one. While these proofs are in some sense natural , it can be shown (assuming a widely believed conjecture… …
4Natural fats — Fat Fat, n. 1. (Physiol. Chem.) An oily liquid or greasy substance making up the main bulk of the adipose tissue of animals, and widely distributed in the seeds of plants. See {Adipose tissue}, under {Adipose}. [1913 Webster] Note: Animal fats… …
5Mohs scale of mineral hardness — The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and… …
6Horseshoe — For other uses, see Horseshoe (disambiguation). Modern horseshoes are most commonly made of steel and nailed into the hoof wall …
7Marginated Tortoise — Taxobox name = Marginated Tortoise status = LR/lc | status system = IUCN2.3 image width = 240px image caption = Sardinian Marginated Tortoise Testudo marginata sarda regnum = Animalia phylum = Chordata classis = Sauropsida ordo = Testudines… …
8Marginated tortoise — Sardinian marginated tortoise Testudo marginata sarda Conservation status …
9Diamond — This article is about the mineral. For the gemstone, see Diamond (gemstone). For other uses, including the shape ◊, see Diamond (disambiguation) …
10Diamond simulant — Due to its low cost and close visual likeness to diamond, cubic zirconia has remained the most gemologically and economically important diamond simulant since 1976. The high price of gem grade diamonds, as well as significant ethical concerns of… …
