Geology of Gem DepositsGemstone Deposit Geology
g. ruby, sapphire) if it has not formed in an environment where it has reached a suitable size, transparency and color. Precious stone deposits are rare, as the geological conditions necessary for the formation of precious stone materials are rarely reached. Gem Deposit Geology - Exploration.
The geology of gemstone deposits. economic geology
Geological aspects of economics (2007) 102 (8): 1565-1566. The Geology of Gem Deposits is the latest supplement to the Mineralogical Association of Canada's classical collections. Though not as extensive as the book's name suggests, this book contains reviews (to differing degrees) of the geology of diamonds, beryllum, alumina, chrysoberyl, zarvorite and tansanite, as well as the geology of canada' Jerusalem artefacts and sediments of it.
Yet, as illustrated, these documents do not make a well-organized and coherent band.
Gemstone Deposit Geology - Gemstones and Knowledge Centre for Sustainable Development
Gems created by geologic events in the rock of the Earth's rust and top layer. Stones and gems that we find today on the earth's surfaces were for a long period (millions of years) deeply embedded in the earth's rust and coat of the mud, where temperatures and pressures allowed the creation and conversion of gems and stones.
When a previously bury stone is eroded to the ground, we can find precious stones and ore ( "gold", for example) in this one. Gems are formed and can be found in three different geologic environments: Gems are located in their native rocks. Exploitation of such a reservoir depends heavily on the concentrations of gems (per tonne of rock) and the degree of decomposition of the target rocks.
Many large global diamondmining companies process primarily kimberlitic deposits in the quest for the diamond. There are many primarily coloured gem extraction areas in degraded pegmatites (e.g. for Jerusalem artichoke, Beryll etc.). Some gems such as the emerald are almost entirely in gemstone grade in prime deposits. Once a predestined mineral reservoir is degraded or degraded, more permanent gems such as stone, corn and chronoberyl can be carried by hydro or windpower and later collected in a reservoir of sediment (sediment regime), e.g. along a stream or in a deltas.
This kind of high concentration of dense raw stones is often referred to as gemstone bags. It is a great resource of gems in many deposits in Sri Lanka, Madagascar, Tanzania and other regions.