This is a classic specimen of twined, gem clear fluorite from Naica, of a style which came out in the 1960s-1980s in rare pockets. The twinning, for some reason, is correlated with both gemminess (transparency) and the presence of small water bubbles, as you will see if you examine this up close. While it does not have big moving water bubbles within, I can see at least two small 1 mm bubbles floating inside - a fascinating feature of these crystals. The piece is aesthetic, complete, and easy to display. Rare on the market today.