Follow Business Insider: Flickr/adactio. A glass of wine a day will not harm your baby and may actually be good for a childâs development, researchers have found. Moderate drinking of between three and seven glasses of alcohol a week does not harm a childâs foetal neurodevelopment, it is said. In tests on balance, a marker of development, children whose parentsâ drank more actually performed better.
Minerals are classified according to: Hardness, Specific Gravity (how it compares with the density of water), Color, Luster, Streak, Cleavage and Crystal Form.
Any rock, mineral, or sediment of economic value â exclusive of metal ores, fossil fuels, and gemstones â is designated as an industrial or a nonmetallic rock/mineral. The two terms are synonymous. Although gemstones are usually excluded, they are listed here for convenience.