Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 12

Sanskrit:

शैली दारुमयी लौही लेप्या लेख्या च सैकती ।मनोमयी मणिमयी प्रतिमाष्टविधा स्मृता ॥ १२ ॥

ITRANS:

śailī dāru-mayī lauhīlepyā lekhyā ca saikatīmano-mayī maṇi-mayīpratimāṣṭa-vidhā smṛtā

Translation:

The Deity form of the Lord is said to appear in eight varieties — stone, wood, metal, earth, paint, sand, the mind or jewels.

Purport:

Śrīla Jīva Gosvāmī explains that certain Deity forms, such as those made of sand, are manifested for a brief time to fulfill a personal desire of the worshiper. Those, however, who desire to attain pure love of God should worship the permanent form of the Deity (made, for instance, of marble, gold or brass), and they should maintain continual worship. In Kṛṣṇa consciousness there is no scope for neglecting the worship of the Supreme Personality of Godhead.