| Sinkankasite | |
| Category: | Phosphate mineral |
| Imasymbol: | Ska[1] |
| Strunz: | 8.DB.20 |
| System: | Triclinic |
| Class: | Pinacoidal (same H-M symbol) |
| Symmetry: | P |
| Color: | Colorless |
| Mohs: | 4 |
| Luster: | Vitreous |
| Diaphaneity: | Transparent |
| References: | [2] [3] |
Sinkankasite, mineral formula:, was named after John Sinkankas (1915–2002), noted author and mineral collector, Scripps Institute of Oceanography.[4] It is triclinic; as colorless, bladed to prismatic crystals up to 4 mm in length, often as divergent, radial aggregates and as pseudomorphs after triphlyte crystals; occurs in the Barker pegmatite (formerly Ferguson pegmatite), east of Keystone, South Dakota, and in the Palermo pegmatite, North Groton, New Hampshire.[5]