Sidha Shila (also called Mukti Shila) is a sacred stone or seat that is revered as the abode of liberated souls in Jain cosmology. It is more a symbol of moksha and eternal right faith/knowledge than a description of a particular mineral.

About the material: Jain scriptures and traditional narrations do not firmly prescribe a single earthly material for Sidha Shila. Some local beliefs or temple legends may claim it is made of crystal (spatik) or other stones, but this is not a universal or authoritative Jain doctrinal point. The important thing in Jainism is the sanctity of the object as a symbol of liberation, not the exact mineral composition.

Differences between Digambar and Śvetāmbara:

• The concept of Sidha Shila exists in both traditions, but the emphasis and terms around moksha-related shrines can vary. The core idea remains the same: a revered seat at the apex of the universe associated with liberated beings.
• Names and ritual usages in temples may differ between the two communities, reflecting their own liturgical traditions.

If you want, I can explain how Sidha Shila fits into the broader Jain understanding of moksha and how devotees traditionally revere such sites, in simple terms.