The Philosopher's Stone

From Author Wars - https://authorwars.com/publications/the-philosophers-stone-578430.html

Overview:

Title: The Philosopher's Stone
Author: Jane Little
Year: 1971
Publisher: Atheneum
Price: $4.50
Pages: 123
Binding: Hardcover
Type: Novel
Title Reference: The Philosopher's Stone
Notes: 1st ed. Publ date from contemporary review by Kirkus (undated online, mixed)

As of 2017-06-06, Amazon US provides no cover image for this, nor for reported June 1971 library binding ISBN-10 0689206925 (not found at WorldCat) Price from Library of Congress.