According to ancient tradition, Issachar had an exclusive partnership with his younger brother Zebulun (the 6th son of Jacob); The tribe of Zebulun partook in business in order to financially support the tribe of Issachar, whereas the tribe of Issachar would toil in spiritual study in order to spiritually support the tribe of Zebulun. Since Zebulun was willing to take on the risk and burden of engaging in commerce for the greater good, his tribe is represented by the Morganite, which is a colorless, adaptable mineral that takes on many tints of color.