In Jainism, the term "Tirthankar tapasya shila" generally refers to the stone or material used to create idols or images of the Tirthankaras (spiritual Ford-makers) in the posture of meditation (tapasyā). Jain scriptures and traditions provide specific guidelines regarding the materials suitable for making such idols to maintain their sanctity and purity.

Materials Used for Tirthankar Idols (Shila):

1. Marble (Sangmarmar):

- White marble is the most preferred material for making Tirthankar idols, especially in the Shwetambar Jain tradition. The color white symbolizes purity and spiritual enlightenment.

1. Black Stone (Krishna Shila or Basalt):

- In the Digambar tradition, black stone is commonly used for Tirthankar idols, as it is considered auspicious and durable.

1. Metal (Panchdhatu):

- Sometimes, idols are also made from Panchdhatu (an alloy of five metals: gold, silver, copper, iron, and zinc), which is considered sacred and long-lasting.

1. Other Stones:

- Various other pure stones such as red sandstone, granite, and soapstone are also used, provided they meet the criteria of purity and are free from cracks and blemishes.

Scriptural References:

• Jain Āgamas and texts like the "Pratishtha Vidhi" and "Acharanga Sutra" mention that the material should be pure (shuddha), without any breakage, holes, or stains, and should not have been previously used for mundane purposes.
• The process of making and installing a Tirthankar idol is called "Pratishtha" and involves elaborate rituals to ensure the material and craftsmanship are in accordance with Jain principles.

Symbolism:

• The choice of the material reflects the values of purity (shuddhata), non-attachment, and the eternal nature of the soul as taught in Jain philosophy.

Summary Table:

| Tradition | Common Material | Significance | |-------------|--------------------------|---------------------------| | Shwetambar | White marble | Purity, enlightenment | | Digambar | Black stone (basalt) | Auspiciousness, durability| | Both | Panchdhatu (five metals) | Sacredness |

If you are referring to a specific temple, idol, or type of tapasya shila, please provide more details for a more focused answer.