A mineral is a naturally occurring solid chemical substance formed through biogeochemical processes, having characteristic chemical composition, highly ordered atomic structure, and specific physical properties. By comparison, a rock is an aggregate of minerals and/or mineraloids and does not have a specific chemical composition. Minerals range in composition from pure elements and simple salts to very complex silicates with thousands of known forms. The study of minerals is called mineralogy. (Wiki)

Database mineral visit here: http://webmineral.com

The Mineralogy Database was last updated on 12/31/2009 and it contains 4,714 individual mineral species descriptions with links and a comprehensive image library. Visit the “What’s New” section for details.  

Each mineral has a page linked to tables devoted to crystallography, crystal structures, X-Ray powder diffraction, chemical composition, physical and optical properties, Dana’s New classification, Strunz classification, mineral specimen images, and alphabetical listings of mineral species. There also are extensive links to other external sources of mineral data and information.

Hari ini Jum”at 13 Juli 2012, RUU Pendidikan Tinggi telah disahkan menjadi UU Pendidikan Tinggi dalam rapat paripurna DPR.

Unduh naskah: RUU Pendidikan Tinggi 

Everywhere in the world, before the intervention of man and fertiliser, soil, vegetation and animal systems evolved naturally to make the most efficient use of the rate of nutrients becoming available from parent materials, assisted by the local climatic conditions. Except during extreme events such as flooding or earthquakes, losses of nutrients to the outside environment were exceedingly small. Animals died and the nutrients they contained were returned to the soil during their decay. Then civilisation came along, and imposed totally new systems, where considerable quantities of nutrients are being removed in produce, and, to maximise production, plant-available forms of nutrients are kept at very high levels in the soil through the use of fertiliser. Unfortunately, at these high levels, nutrients are prone to loss to the atmosphere (in the case of N), and, in the case of all nutrients, in run-off to waterways and in leaching.

source: http://www.groupone.co.nz