| Hoelite | |
| Category: | Organic mineral |
| Formula: | C14H8O2 |
| Imasymbol: | Hoe[1] |
| Strunz: | 10.CA.15 |
| Dana: | 50.4.2.1 |
| System: | Monoclinic |
| Class: | Prismatic (2/m) (same H-M symbol) |
| Symmetry: | P21/a |
| Unit Cell: | a = 15.81 Å, b = 3.967 Å c = 7.876 Å; β = 102.67°; Z = 2 |
| Color: | Yellow, yellowish green |
| Habit: | Acicular clusters; pseudo-orthorhombic |
| Cleavage: | Good |
| Streak: | Light yellow |
| Diaphaneity: | Semitransparent |
| Gravity: | 1.42 |
| Opticalprop: | Biaxial (+) |
| Refractive: | nα≈1.75, nβ≈1.75, nγ≈2.0 |
| References: | [2] [3] |
Hoelite is a mineral, discovered in 1922 at Mt. Pyramide, Spitsbergen, Norway and named after Norwegian geologist Adolf Hoel (1879–1964). Its chemical formula is C14H8O2 (9,10-anthraquinone).[2]
It is a very rare organic mineral which occurs in coal fire environments in association with sal ammoniac and native sulfur.[2]