Possible Clues:

• List including fixed location of stone
• A pile of rocks mounted outside place somewhere in Egypt
• ___ Stone (hieroglyphic key)
• Whence Champollion's stone
• Place stone key to Egyptian studies was found
• Source of revelatory stone placed in list
• The ____ stone provided the key to the deciphering of ancient Egyptian texts
• __ Stone: software for language learners
• -- Stone, ancient artefact
• ___ Stone (Egyptian tablet)