Shaligrama is the most sacred stone for Vaishnavas.
There is a story thus of Tulasi cursing Vishnu to become a stone when He polluted Her Chastity to kill Her husband.
What is the story of Vishnu becoming stone Shaligrama.
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The story is found in the Devi BhAgavatam for example.
Lord Vishnu has to take away the chastity of Tulasi, the wife of Shankhachuda. And which he did and when Tulasi discovered that out, she cursed him to be turned into a stone.
12-13. O Thou, the Ocean of mercy! Now tell me of your heroic valour, how you have come out victorious in war with Mahâdeva who destroys countless universes. Hearing Tulasî’s word, the Lord of Laksmî, in the guise of S’ankhachûda, spoke these nectar-like words with a smiling countenance. 14-17. O Dear! Full one Samvatsara the war lasted betwixt us. All the Daityas were killed. Then Brahmâ Himself came and mediated. Peace, then, was brought about and by the command of Brahmâ, I gave over to the Devas their rights. When I returned to my home, S’iva went back to His S’ivaloka. Thus saying, Hari, the Lord of the world, slept and then engaged in sexual intercourse with her. But the chaste Tulasî, finding this time her experience quite different from what She used to enjoy before, argued all the time within herself and at last questioned him :--
18-22. Who are you? O Magician! By spreading your magic, you have enjoyed me. As you have taken my chastity, I will curse you. Bhagavân Nârâyana, hearing Tulasî’s words and being afraid of the curse, assumed His real beautiful figure. The Devî then saw the Eternal Lord of the Devas before her. He was of a deep blue colour like fresh rain-clouds and with eyes like autumnal lotuses and with playful Lîlâs equivalent to tens and tens of millions of Love personified and adorned with jewels and ornaments. His face was smiling and gracious; and he wore his yellow-coloured robe. The love-stricken Tulasî, seeing That Lovely Form of Vâsudeva, immediately fell senseless; and at the next moment, regaining consciousness, she began to speak. 23-27. O Lord! Thou art like a stone. Thou hast no mercy. By hypocrisy Thou hast destroyed my chastity, my virtue and for that reason didst kill my husband. O Lord! Thou had no mercy; Thy heart is like a stone. So Let Thee be turned into a stone.
And, finally Lord Vishnu accepts the curse. And these ShaligrAma stones are found in the Gandaki river bed in Nepal, as is quite well known.
And as for Me, I will be turned into stone by your curse; I will remain in India close to the bank of the river Gandakî. Millions and millions of insects with their sharp teeth will make rings, (the convolutions in the S’âlagrâma or sacred stones), on the cavities of the mountains there, representing Me.
BTW, you should also read the chapters previous to this one, which describe why Shankachuda was invincible and why all of this was needed.