Amethyst is a popular form of quartz that ranges from a bright to dark or dull purple color. The world's largest deposits of amethysts can be found in Brazil, Mexico, Uruguay, Russia, France, Namibia and Morocco. Sometimes amethyst and citrine are found growing in the same crystal.It is then referred to as ametrine.ilk quartz or milky quartz is the most common variety of crystalline quartz. The white color is caused by minute fluid inclusions of gas, liquid, or both, trapped during crystal formation, making it of little value for optical and quality gemstone applications.
I have a 55 gallon tank. Currently I have 3 rainbows (2 goyder river, 1 Parkinsoni). I was just wondering how many more rainbows I should/could stock?I also have a RTS in the tank... and I was thinking that I might also like a small school of tetras or threadfin rainbows in the mix.he rainbows that you currently have will max out at about 4-5, so you probably could add 3 to 5 more in that size range. Then if you added some threadfin (max size around 2) in a group of 8-10 would be pretty. Or, if you added some Celebes (max size around 3) then a group of 6 would be neat.
Rating Newest Oldest. Best Answer: Actually, a 55 gallon aquarium, with just water, weighs about 625 lbs. and then you need to add probably 60 lbs. for gravel and a little more for decorations. How much depends on whether they're plastic or real rock, etc.5 gallon tank filled would have a total weight displacement of 458.15 lbs + tank weigh of about 165 lbs= 625 lbs. http://freshaquarium.about.com/cs/tipsan... That much weight is considerbly less then say a waterbed which you can find on many second floor places.