Need I.D. Help!

[I.B.Diggin]

Howdy Y'all! i have a gem/mineral that maybe someone here can help I.D.! Here's the back-story: it was found in a swimmin' hole on st.francois river(S.E.Mo.) some 30+ yrs ago, It is translucent,with a yellow hue, and heavy for its size! maybe 5-6 lbs.! it's sorta half moon shaped! about the size of 2 grapefruits! took it to jeweller awhile back and he told me, not glass!! maybe Lemon Quartz but not sure. What are the other possibilities?? (sorry! no Pix!)

 

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[DevilDog812]

pics would definitely help.
it could be yellow fluorite like this though

 

[Arid-Zone-A-seeker]

Lemon Quartz is made by heating and such,,,can you do a picture?
Can you knock a small chunck off, sometimes minerals like iron can leave a "wash coating" on quartz, that makes you think the whole is colored, but only the outside has color. Baring that the piece is citrine, you still might have a nice chunck for faceting some nice gem stones.

 

[Eu_citzen]

Citrine (yellow quartz) is heated Amethyst. It can be heated by nature or by human intervention.
But without a picture there is very little to go on.

 

[kjunova]

Looks a lot like flourite. They grow in cube shapes. It comes in all kinds of colors.
http://en.wikipedia.org/wiki/Fluorite