Strontianite (SrCO3) is a mineral consisting of strontium carbonate. This mineral is white, greenish, or yellowish in color,
usually occurring in fibrous massive forms, but sometimes in prismatic[?]crystals.
... most well known Christian books on devotion.
I. Life, Minor Writings
Thomas à Kempis, German mystic and author of the "Imitation of Christ," was born at Kempen[?], ...