This is a stunning stalactite from India. It is not only stunningly pretty, it is also really unusual. That is because amidst the super-gemmy, glassy apophyllites and peachy, pearly stilbites is a lone, sharp, opaque heulandite (usually they are an orange/peach color, so this one really stands out). In summary, you have a wonderful zeolite suite here, in addition to a really pretty mineral specimen.