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Blue, unbanded fluorite occurs in many localities around the world. Within the UK, blue fluorspars are also found in County Durham, especially Weardale. [1]: 39 Elsewhere, blue fluorspar is known in the Ardennes region of Belgium; the Cave-in-Rock area of Illinois in the United States; [1]: 39 and at various localities in Mexico and China.
Fluorite is allochromatic, meaning that it can be tinted with elemental impurities. Fluorite comes in a wide range of colors and has consequently been dubbed "the most colorful mineral in the world". Every color of the rainbow in various shades is represented by fluorite samples, along with white, black, and clear crystals.
AIs are typically matched to actual average consumption, with the assumption that there appears to be a need, and that need is met by what people consume. The current AI for women 19 years and older is 3.0 mg/day (includes pregnancy and lactation). The AI for men is 4.0 mg/day. The AI for children ages 1–18 increases from 0.7 to 3.0 mg/day.
Data over a 15-year span showed a reduction of more than 60% in tooth decay among 30,000 school children in Grand Rapids, demonstrating fluoride's protective benefits.
[40] The cost of adding fluoridation to the water of 44 Florida communities has been researched by the State Health Office in Tallahassee. [41] In communities with a population of over 50,000 people, fluoridation costs were estimated at 31 cents per person per year. The estimated cost rises to $2.12 per person in areas with a population below ...
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In most drinking waters, over 95% of total fluoride is the F − ion, with the magnesium–fluoride complex (MgF +) being the next most common. [citation needed] Because fluoride levels in water are usually controlled by the solubility of fluorite (CaF 2), high natural fluoride levels are associated with calcium-deficient, alkaline, and soft ...
5 symptoms men over 40 should never ignore. Jessica Firger. December 7, 2024 at 5:35 AM. ... An online survey conducted by the Cleveland Clinic of 1,174 men 18 years or older, ...