Fiona and I have experienced many such places over the last week - of course we seek them out. Whilst I could share many photos of standing stones and stone circles such as the Callanish stones below; it can be the carving that gives meaning; or just the particular type of stone; or placing of stones that give meaning.
Marked - carved stone - Iona
Stone chosen for its texture and inclusions - Callanish and Lochbuie stone
All this stone is of nature but given meaning and purpose by folk.