礦物之美

Path :: Gem Gardens ->Types of gemstone deposits

寶石礦床的種類

* 圖說：瑪瑙

Placer deposits

Placer deposits are valuable minerals that have been weathered and broken down into sand gravel, and accumulate on river banks or beaches due to their higher specific gravity content. These deposits ..........

.... more

Hydrothermal deposits

Hydrothermal deposits are mineral deposits formed from solutions containing volatile and metallic elements heated by late stage magmatic activities. Changes in external environment result in the ..........

.... more

Secondary deposits

Secondary minerals are formed from the precipitation of primary minerals, dissolved by groundwater, at near-room temperature close to the surface. Gemstones formed as secondary deposits include ..........

.... more

推薦關鍵字