Many different minerals are prized for their rarity and beauty. For example, phosphophyllite, crocoite, zoisite variety "tanzanite", to name just a few, are not found at many places, come in stunning colors and large, lustrous crystals, and can command enormous prices.
A gem
Melachite is a bright green mineral that can be shined to a high polished finish.
Fertile Soil
Either, or both. Minerals are usually considered gems if they are valuable, attractive and highly pure. Minerals are considered ores if they are used to extract a substance. For example, pure haematite is polished and sold as a gem, while crude haematite is used to extract iron.
Fracture refers to the appearance of the freshly broken mineral. Chert or flint, for instance, has a conchoidal fracture.
Uranium has more than 200 minerals ! Each mineral has another appearance.
a gem
crystals
A rare mineral that can be cut and polished could be called a gemstone.
Gold is a valuable mineral
a rock
Yes.
Yes.
This would be called a gemstone.
yes jade is an less valuable mineral than gold
As a mineral commodity in relation to other mineral commodities, not especially so. To a manufacturer that depends on graphite and has no substitute mineral, it would be very valuable.
Melachite is a bright green mineral that can be shined to a high polished finish.
Opal, (although it's not a true mineral).