Shaalgraam has been praised a lot in our scriptures. Some of the quotes are given here---

Lord Shiv states, "My devotees who offer obeisance to the Shaalgraam even negligently become fearless. Those who adore me while making a distinction between myself and Lord Hari will become free from this offence by offering obeisance to Shaalgraam. Those who think themselves as my devotees, but who are proud and do not offer obeisance to my Lord Vaasudev, are actually sinful and not my devotees. O my son, I always reside in the Shaalgraam. Being pleased with my devotion the Lord has given me a residence in His personal abode. Giving a Shaalgraam, is the best form of charity, being equal to the result of donating the entire earth together with its forests, mountains, and all."

"In Poojaa of Shaalgraam, it is unnecessary to call the Lord for worship or request Him to return His abode upon completion."
-- Bhaagavat Puraan

Naivedyam Purato Nyastam Drishtwaiv Sweekritam Maya
Bhaktasya Rasanaagren Rasam Asnaami padmajaa
-- Brahm Puraan
Naaraayan said - "O Brahmaa, If someone makes an offering of food grains in front of Shaalgraam Shilaa (who is non-different from Me), I just by looking at it eat it, but I taste the food when My devotees touch it with their tongues (eat it).

Khanditam Sphootitam Bhagnam Paarshwa Bhinnam Vibheditam
Shaalgraam Samudbhootam Shailam Doshvaham Na Hi
-- Brahm Puraan
Lord Vishnu states that, "Any Shilaa from the place of Shaalgraam can never be inauspicious though cracked, chipped, split in two though still in one piece, or even broken asunder."

"As long as Mahaa Vishnu abides in the Shaaligraam, all the benevolent spirits live there, all gods and all the 14 worlds live there. Shaalgraam lose their power only when 10,000 years of kali Yug have passed."
-- Brahm Vaivart Puraan, Pakriti Khand

"Any religious observances, auspicious gifts, Nitya Poojaa, obsequies of the last rites (Shraaddh) ceremonies in the presence of Shaalgraam is very meritorious.
-- Brahm Vaivart Puraan, Prakrirti Khnad

Naarad Muni states, "It is impossible to fully explain the importance of Tulasee leaves (Holy Basil) in the worship of Shaalgraam, as Tulasee is the most beloved consort of Hari in the form of Shaalgraam."
-- Brihannaaradeeya Puraan

Ato'dhisthaan Vargesu Sooryadisviva Moortisu |
Shaalgraam Shilaiv Syad Adhisthaanottamam Hareh ||
-- Garud Puraan
The Lord resides in many places in which he may be worshipped, but of all the places Shaalgraam is the best.

The rites of expiation of sins (Praayashchiit or Parikaar) become most effective in times of Lunar and Solar Eclipses, whatever ritual is undertaken becomes more effective when done in front of Shaalgraam.
-- Hemaadri

Gangaa Prayaag Gayaa Naimish Pushkarni
Punyaani Yani Kuru Jangalaa yaa Munaani
Kaalen Teerth Salilaani Punanti Paapam
Paadodakam Bhagavatah Prapunati Sadyah
-- Narasinh puraan
Gangaa, Prayaag, Gayaa, Naimish, Pushkar, Kurukshetra, together with other places of pilgrimage, remove the sins of a person after long connection with them. But water which has washed the lotus feet of the Supreme Personality of Godhead purifies a person at once.

Deekshaa Vidhaan Mantragya Chakre Yo Balim Ahaaret
Sa Yati Vaishnavam Dhaamam Satyam Satyam Mayoditam
-- Padm Puraan
Anyone who has attained Mantra Deekshaa initiation properly and is worshiping Shaalgraam Shilaa, whatever he offers to Shalagram Shila, he achieves the abode of Lord Visnu. Of this, there is no doubt. I personally say this.

Gangaa Godaavaree Revaa nadyo Mukti Pradas Ti Yah
Nivasanit Sa teerthas Tah Shaalgraam Shilaa Jale
Koti Teerth Sahastrais Tu Sevitaih Kim Prayojanam
Teerthan Yadi Bhavet Punyam Shaalgraam Shilodbhavam
-- Padm Puraan
The water which washed Shaalgraam Shilaa includes the water from the Gangaa, Godaavaree, Revaa and other liberating rivers. If this bath water from the Shaalgraam Shilaa is available, then there is no need for thousands of other places of pilgrimage.

Kaamaih Krodhaih Pralobhais Ch Vyaapto Yo'tra Naraadhamah
So'pi Yati Harer Lokam Shaalgraam Shilaarchanat
-- Padm Puraan
Those people who are the lowest of mankind and who are controlled by lust, anger and greed can be elevated to the abode of Lord Hari by worshiping Shaalgraam Shilaa.

Shaalgraam Shilaa Roopee Yatra Tisthati Keshavah |
Tatra Devasurayaksa Bhuvanaani Chaturdash ||
-- Padm Puraan
With Keshav in the form of Shaalgraam Shilaa reside all the Devtaa, Asuar, Yaksh and the fourteen worlds.

Shaalgraam Shilaa Chakram Yo Dadyad Daanam Uttamam
Bhoo Chakram Ten Dattam Syaat Sashailam Van Kaananam
-- Padm Puraan
Giving charity of Shaalgraam Shilaa is the best of all charities. Any person who has given this charity has achieved the result of performing all auspicious activities and he has given charity of the whole earthly planet, decorated with forest, jungles, and mountains.

Shaalgraam Shilaa Toyam Yah Pivat Bindu Samam Matuh
Stanyam Punar Naiv Sapivet Bhakti Bhang Narah
-- Padm Puraan
Any person, if he has even taken one drop of water which has washed Shaalgraam Shilaa, he will not have to suck a mother's breast again in the future.

Shaalgraam Shilaayantu Saakshaat Shree Krishn Sevanam
Nityam Sannihit Tatra Vaasudevo Jagadguruh
-- Padm Puraan
The worship of Shalagram Shila is the worship of Lord Hari directly. Jagat Guru, the spiritual master of the universe, Vaasudev, eternally resides within Shaalgraam Shilaa.

Ye Pivanti Nar Nityam Shaalgraam Shilaa Jalam
Panchgavya Sahastrais Tu Sevitaih Kim Prayojanam
-- Padm Puraan
Any person who has drank the water which has bathed Shaalagraam Shilaa, what is the need for them to drink thousand and thousands of times Panchgavya? (Panchgavya is made from five auspicious products of a cow offered to the Lord.)

"All those holy rivers awarding Moksh, such as the Gangaa, Godaavaree and others, reside in the Charanaamrit of Shaalgraam."
-- Padm Puraan

"If the obsequies or the last rites are conducted in front of the Shaalgraam, then the departed soul will directly reach Vaikunth and subseuent death ceremonies become unnecessary. Gifts given in the vicinity of Shaalgraam will be instantly purified
-- Padm Puraan

Bhaktya Bhunakti Naivedyam Shaalgraam Shilarpitam
Kotim Makhasya Labhate Phalam Shat Sahasrasah
-- Skand Puraan
One who eats food after offering it to Shaalgraam Shilaa, he achieves the results of performing one hundred times one thousand times one million fire sacrifices.

Drishtawa Pranamit Yen Snapit Poojit Tathaa |
Yagya Koti Samam Punyam Gavam Koti Phalam Bhavet ||
Lord Shiv speaking to Skand, "Any person who has seen Shaalgraam Shilaa, paid obeisance to Him, bathed and worshipped Him, has achieved the results of performing ten million sacrifices and giving 10 million cows in charity.
-- Skand Puraan

Poojito'ham Na Tair Martyair Namito'aham Na Tair Narah
Nakratam Martya Loke Yaih Shaalgraam Shilaarchanam
-- Skand Puraan
Lord Shiv speaks to his son, Skand - "In this mortal world, if anyone does not worship Shaalgraam Shilaa, I do not at all accept any of their worship and obeisance.

Shaalagraam shilaayaam yo moolyam udghatayet narah |
Vikret cha anumanta cha yah pareeksham udirayet ||
Sarve te narakam yanti yavad ahoota samplavam |
Atah samvarjayed vipra chakrasya kraya vikrayam ||
--Skand Puraan (Haribhakti Vilaas: 5/436, 437)
"Oh Braahman, no one should ever buy or sell Shaalgram Shilaa. The material value should never be attempted. Never should a Shaalagraam Shilaa be criticized. Such offenders inhabit hell until the end of the creation" - Shiv says to his son Skand.

Striyo va Yadi va Shoodra Braahmanah Kshatriya Dayah
Poojayitwa Shilaa Chakra Labhante Shaashwatam Padam
-- Skand Puraan
Brahmaa Jee said to Naarad Jee - "Worship of Shaalagraam Shilaa can be done by women, Shoodra, Braahman, kshatriya etc. and they can all achieve the eternal abode of Lord Krishn perfectly.

Sa Dhanyah Purusho Loke saphalam Tasya Jeevitam
Shaalgraam Shilaa Shuddh Grahe Yasya Cha Poojit
-- Skand Puraan
In any house, if a person worships Shalagram Shila properly, those persons are glorified and their existence is successful in this world.

Yo Dadaati Phalam Vishnoh Shaalgraam Samudbhavam
Vipraya Vishnu Bhaktaya Ten Ishtam Bahubhir Makjaih
-- Skand Puraan
Any person who has donated a Shaalgraam Shilaa to the devotee of Lord Visnu (Vaishnav) or to a qualified pure Braahman, he has achieved the results of performing unlimited sacrifices and austerities.

Shiv says to his son Skand - "All the 3 worlds in their entirety, and he himself abides in a Shaalgraam and a mere glance at it, is meritorious, and much more so worshipping it."
-- Skand Puraan, Kaarttik Maas Mahaatmya

"By taking the remnants of foodstuffs offered to Shaalgraam, one will get the result of performing many sacrifices."
-- Skand Puraan

Lord Shiv also states, "Even if a Shilaa is cracked, split, or broken it will have no harmful effect if it is worshiped with attention and love by a devotee. It further states there that the Supreme Lord Hari, along with His divine consort, Lakshmee, live in the Shaalgraam that has either only the mark of a Chakra, a Chakra along with the mark of a footprint, or only a mark resembling a flower garland."
-- Skand Puraan

Lord Shiv tells Paarvatee, "He who takes the Charanaamrit of Shaalgraam destroys all sinful reactions at their roots, even the killing of a Braahman."
-- Skand Puraan

Shaalgraam Shilaayantu Pratishthaa Naiv Vidyante
Mahaa Pujantu Kritwadau Poojayet Tam Tato Buddhah
-- Skand Puraan
"Shaalgraam do not require installation ceremony. When one begins the worship of Shaalgraam, however he should start with elaborate Poojaa using all articles. The worship of Shaalgraam is the best form of worship, better than the worship of the Sun."

Snigdh krishn Pandar va Peet Neel Tathaiv Cha
Vakra Ruksh Cha Rakt Cha Mahaa Sthool Tu Laanchhitaa
Kapilaa Dardur Bhagn Bahu Chakraik Chakrik
Brihan Mukhee Brihachchakra Lagn Chakratav Punah
Baddh Chakra Athavaa Kachid Bhagn Chakra Twa Adhomukhee
-- Skand Puraan
There are different kinds of Shaalgram Shilaa available such as oily ones, black ones, yellow ones, blue ones, crooked, dry ones, red ones, huge ones, without any marks, brown ones, in the shape of a frog, broken, with one or many disk marks, with many faces, non-specific? grand disk mark?, with a broken disc, facing down, complete disc, half disc, etc.

"The Shaaligraam represents the everlasting presence of Lord Vishnu, the Vibhooti present in these sacred stones are of an Akhand variety."
Prameya Ratnaakar enumerates 5,535 forms of Vishnu reside in it, while iconic forms are only 513.
-- Vishnu Puraan

Gandakyashchiv Deshe Cha Shaalgraam Sthalam Mahat
Paashaanam Tadbhavam Yat Tat Shaalgraamam Iti Smritam
-- Gautameeya Tantra
Near the Kaalee Gandakee River, there is a big place called Shaalgraam. The stones which appear in that place are called Shaalgraam Shilaa.

"Merely by touching a Shaalgraam one becomes freed from the sins of millions of births, so what to speak of worshiping Him! By Shaalgraam Poojaa one gains the association of Lord Hari."
-- Gautameeya Tantra

Bhakt should take the Charanaamrit mixed with Tulasee leaves from the Shaalgraam in their hand and sip it, sprinkling the balance on their heads."
-- Gautameeya Tantra

"Shaalgraam should not be placed on the earth or ground and worshipped."
-- Sammohan Tantra

"A Shaalgraam stone damaged in any way, chipped, broken, split or cracked will not become unfit for worship. It is always sacred and worthy to worship. It does not lose its auspicious nature even if it is damaged ."
-- Puja Prakash

"If a dying person sips water in which Shaalgraam is bathed, he will be freed from all sins.and if the death itself ovvurs in the presence of Shaalgraam, the path to Vishnu's abode is cleared for the departing soul.
--Puraan Sangraha