Spiraling mineral cluster of thin crystals, tightly bundled in a swirled geode lined with calcite and what appears to be even larger calcite crystals. From images, it is difficult to identify the mineral cluster. It is possible this is heulandite, angelwing chalcedony, or rose quartz gem. These are all igneous metamorphic mineral stones that during their formation will develop a pink color variation and similar formation. An in-person evaluation will assist in identifying age and if the specimen is geologic or biologic in development. An excellent example with a well detailed exterior matrix. Specimen measurements are approximately 6 inches x 8 inches, unknown weight. I formed these valuations for you after researching other items in databases that I believe could be comparable. I also suggest that, when you have time, you take your item to a regional natural science museum or university department. Your local library may also be able to connect you with resources; sometimes these organizations will host specialist days for in-person assessment. Mearto also has an appraiser directory resource page: https://mearto.com/appraisers. An affirmative identification, could increase the FMV.
