User:Callinus
Jump to navigation
Jump to search
Recommended reading:
Interesting:Wikimedia Projects serve the Information Needs of Individuals, Not Groups "it is important to note as essential the principle that Wikimedia projects exist to serve individuals, as individuals, in their full autonomy, and consequently, the projects, as a general rule, do not and should not consider as legitimate censorious demands by institutions, of any kind, political, commercial or voluntary claiming to represent those individuals, or making demands, which, in the community’s opinion, represent only their own interests"
Hi there
|
Celestine is a mineral consisting of strontium sulfate (SrSO4). It is named for its occasional delicate blue color. Celestine and the carbonate mineral strontianite are the principal sources of the element strontium, commonly used in fireworks and in various metal alloys. The mineral occurs as crystals, and also in compact massive, and fibrous forms. It is found worldwide, mostly found in sedimentary rocks, usually in small quantities. Pale blue crystal specimens, as shown in this photograph, are found in Madagascar.Photograph credit: Ivar Leidus
- Some Picture of the year winners