Iceland Spar, the Stone of Clarity – Bold Oracle Studios
Icelandic spar, also known as optical calcite, Icelandic crystal, and Viking sunstone. Vikings would use its light-polarizing properties to locate the sun to navigate the seas even on the cloudiest of days. :
Viking Sunstone (Optical Calcite) | prettygoods
Iceland Spar Viking Sunstone Optical Calcite Crystal Snowflake Pendant – My Mystic Gems