I am sick and tired of seeing "fluorite" spelled "flourite".
There is a big difference between using a crystal material with superior refractive qualities and using a clay gravel material (for lining aquariums) in a refractor telescope. I realize that it is an easy mistake but nearly 40% of the ads here on Astromart have it spelled wrong. This is flourite:
http://www.seachem.com/en_products/product_pages/049_flourite.html
As you can see it wouldn't make a very good refractor lens :-)
Clear Skies,
Joplin
There is a big difference between using a crystal material with superior refractive qualities and using a clay gravel material (for lining aquariums) in a refractor telescope. I realize that it is an easy mistake but nearly 40% of the ads here on Astromart have it spelled wrong. This is flourite:
http://www.seachem.com/en_products/product_pages/049_flourite.html
As you can see it wouldn't make a very good refractor lens :-)
Clear Skies,
Joplin