It relies on 4 characteristics:BeautyDurabilityHardnessRarity.Beauty is the clearness (clear doesn"t always mean precious more), color and also brilliance, aka the brightness. Durability and also hardness are fairly the same, the more tough and more durable, the far better (think the diamonds space the hardest known natural material). Then rarity. Part minerals are an extremely rare (big diamonds). The rarer, the pricier that course. Additionally the means it is reduced makes a huge difference.

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1) Haematite. This is a mineral (a natural oxide of iron) it likewise serves together a major ore of iron and can be cut into attractive forms to use as a gemstone. Sphalerite. This is a mineral (a natural sulphide that zinc) the is also a major ore that zinc. Pure sphalerite have the right to be fashioned into very beautiful gems yet these are only for collectors as the softness and also easy cleavage the sphalerite make it rather unsuitable for mounting in jewellery. Diamond. This is a Native facet (to fit the definition of a mineral a substance needs to be naturally arising chemical link which diamond is not) it is mounted directly into industrial tools due to its hardness however cannot be thought of as an ore. It also is reduced into a range of exquisite gems.2) Most quartz is not thought about a gemstone because it lacks characteristics important in jewelry, such as shade intensity and also clarity. The mass of quartz on earth is contained in milky white veins, substantial granite, quartzite formations, and also sands. And not every colored quartz favor agate, amethyst, or jasper is gem-quality. Even these come in various grades, established by shade intensity, internal patterns, clarity and capability to take it a polish.3) It is non-toxic, durable and lightweight.4) All gems are minerals, yet not every minerals space gems. In order for the mineral to it is in classified as a gem, the mineral must have actually very details qualities.5) Many ores are found in vein mineral deposits. These deposits type when ions of steels dissolve in fluids and collect in weak components of rock, such together cracks and surfaces between layers. To remove the ore, miners also must eliminate the bordering waste rock.

In order to be taken into consideration a gemstone, a mineral must an initial of every be beautiful. In addition, it have to be hard and also durable. Its value rises if the is likewise rare.The beauty of a gem is measure in terms of its clarity, brilliance, and also color.



How has the scientific neighborhood addressed the safety of chemicals? a. Chemistry are consistently tested, even those that have actually existed because that a lengthy time. B. Currently chemicals space tested if they have never been tested before. C. Chemicals are tested if they space suspected to have caused a problem. D. Only new chemicals room tested.

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Answers: 2
Chemistry, 22.06.2019 02:00
Will provide brainliest it is a lab from k12 right here is the linkfor each metal that participated in a chemical change, compose the form of metal it is, based upon your check of the routine table. Type your prize here. (score for question 3: the 5 points) to be there any type of metallic compounds that did not react with either the mountain or the base? create the form of metal, based on your check of the regular table. Form your prize here. (score for concern 4: of 5 points) do a general statement around the reactivity the the metals in this experiment. Kind your answer here.