User:Stone/Fluoride
Elemental potassium does not occur in nature because it reacts violently with water (see section Precautions below).[1] As various compounds, potassium makes up about 2.6% of the weight of the Earth's crust and is the seventh most abundant element, similar in abundance to sodium at 2.8% of the crust.[2] In seawater, potassium at 0.39 g/L (0.039 wt/v %) is far less abundant than sodium at 10.8 g/L (1.08 wt/v %).[3][4]
Orthoclase (potassium feldspar) is a common rockforming mineral. Granite for example contains 5% potassium which is well above the average in the Earth's crust. Some minerals with a very high potassium contain are for example niter, sylvite, carnallite, kainite and langbeinite. All of those minerals are used to produce potassium compounds.[4] Salt]], NaFe4S3(CO)7
- ^ Cite error: The named reference
HollemanAF
was invoked but never defined (see the help page). - ^ http://books.google.de/books?id=iXfhFnoQBQ0C&pg=PA80.
{{cite book}}
: Missing or empty|title=
(help) - ^ http://books.google.de/books?id=NXEmcGHScV8C&pg=PA3.
{{cite book}}
: Missing or empty|title=
(help) - ^ a b http://books.google.com/books?id=zNicdkuulE4C&pg=PA723.
{{cite book}}
: Missing or empty|title=
(help)