As I discuss in this answer, one of the early movements that was important in the development of Vaishnavism was the ancient Pancharatra movement, whose sacred texts consist of detailed procedures to worship the sage Narayana, an ancient incarnation of Vishnu who was the twin brother of the sage Nara. (Nara and Narayana were the previous births of Arjuna and Krishna, respectively.) One of the Pancharatra texts is the Lakshmi Tantra, which takes the form of a dialogue between Indra and Vishnu's wife Lakshmi.
In any case, in this excerpt from the Lakshmi Tantra, Lakshmi describes to Indra the glories of the Sri Sukta, a famous hymn to Lakshmi from the Rig Veda:
My spotless garland made of silver lotuses is ever sparkling. All creators, who create the worlds are adorned with me (i.e. with my presence). In ancient times the forefather of the Rudras, (propitiating me as) Rajatasraj, went to mount Kailasha and became the lord of silver.
For those who don't know, the forefather of the Rudras is Shiva, as I discuss in this answer.
So my question is, what is the story of Shiva becoming the lord of silver after worshipping Lakshmi? I'm not sure what "the lord of silver" means. The translator just says that Shiva "is often compared to a silver mountain".
But are there any other scriptures which describe Shiva as becoming the lord of silver after worshiping Lakshmi? Also, on a side note there are many scriptures which describe Shiva worshipping Vishnu (like the Mahabharata chapter I discuss here), but I think this is the first reference I've seen to Shiva worshipping Vishnu's wife Lakshmi. Are there any other occasions where he worshipped Lakshmi?