Please help me identify this shell--Buddhists believe it is special

[fsrobin]

The spiral within this shell goes clockwise (unusual) and Buddhists believe it has special magical powers.  I found several of them at a garage sale here in Florida and took it to Bhutan in the Himalayas where religious leaders found it to be a special gift.  I'd like to buy more and better specimens but don't know where to find them for sale and what the name is.  Please email me for a photo as I have not been aboe to post the photo here--too complicated.

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Thanks for your help,

Robin Smillie
Tampa, Florida