Color                            Orange-red, red, yellowish
Crystal system               Triclinic
Cleavage                       [010] perfect, [100] distinct, [001] distinct
Mohs scale hardness     2½
Luster                           Vitreous
Streak                           Light yellow
Diaphaneity                   Transparent
Density                          2.69 g/cm3

Lopezite mineral data

Mineral Name:   Lopezite

Potassium dichromate      K ₂ Cr ₂ O ₇