Short answer: Yes, a murti made of marble powder can be suitable for a Jain home shrine, as long as it supports your devotional practice and is made and used in a respectful, non-harmful way.

Key points to consider:

• Purpose and attitude: The murti should help you focus on renunciation, non-violence (ahimsa), and the teachings of the Tirthankaras. Avoid letting the image become a source of attachment or ego.
• Material and making: Ensure the statue is crafted with care and without harming living beings. Marble powder itself is a common decorative material; what matters is the intention and reverence with which it is used.
• Pran-pratishtha and puja: Regular, simple worship (offering flowers, water, light, and prayers) with a clean, respectful space is appropriate. If possible, have a qualified Jain priest perform or guide the consecration (pran-pratishtha) and proper mantras.
• Sects: Digambar and Shwetambar traditions both use images in home shrines, but they may differ in specific prayers, mantras, and decorative customs. Choose practices that align with your family tradition and guidance from a trusted Jain teacher.
• Placement and care: Place the murti in a clean, quiet corner. Keep the area tidy, avoid harsh chemical fragrances or pollutants, and maintain regular personal discipline in daily puja.

If you’d like, tell me which Jain tradition you follow (Digambar or Shwetambar) and I can tailor tips for your specific home-puja setup.