ID help for interesting crystal

Hello Everyone,

I would love some help identifying an interesting crystal I found about two years ago. The specific gravity is: 25.2g/9.3cm= 2.73913043 or 2.74g/cm³

I’ve never seen anything like this. It’s got a shell around the clear crystals. Hoping it is familiar to someone!
Thank you in advance.

My initial thoughts on it are calcite crystals inside limestone perhaps? Looking forward to hearing from others when you get a chance. Thanks :pray:

Here’s another one for identification. It’s more lavender than it looks in the photos but I think it is sugilite. The specific gravity checks out and I feel about 90% certain but I would like to hear others opinions.