mode

 The divisions of the eighteen Puranas is defined by Lord Shiva to Uma in the Padma Purana (Uttara Khanda 236.18-21):

" O beautiful lady, one should know that

1. the Vishnu, Naradiya, Bhagavata, Garuda, Padma and Varaha Puranas are all in the mode of goodness. 
2. The Brahmanda, Brahma-vaivarta, Markandeya, Bhavisya, Vamana and Brahma Puranas are in the mode of passion. 
3. The Matsya, Kurma, Linga, Shiva, Skanda and Agni Puranas are in the mode of ignorance.

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