Hoelite
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| Hoelite | |
|---|---|
 Yellow acicular crystals of Hoelite (picture size: 10 mm) |
|
| General | |
| Category | Organic minerals |
| Chemical formula | (C6H4)2(CO)2 |
| Strunz classification | 10.CA.15 |
| Dana classification | 50.4.2.1 |
| Crystal symmetry | Monoclinic prismatic H-M Symbol (2/m) |
| Unit cell | a = 15.81 Å, b = 3.967 Å, c = 7.876 Å; β = 102.67°;, Z = 2 |
| Identification | |
| Color | Yellow, yellowish green |
| Crystal habit | Acicular clusters |
| Crystal system | Monoclinic - pseudo-orthorhombic |
| Cleavage | Good |
| Streak | Light yellow |
| Diaphaneity | Semitransparent |
| Specific gravity | 1.42 |
| Optical properties | Biaxial (+) |
| Refractive index | α≈1.75 β≈1.75 γ≈2.0 |
| References | [1][2] |
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 (C6H4)2(CO)2[3] or C14H8O2.[1]
It is a very rare organic mineral which occurs in coal fire environments in association with sal ammoniac and native sulfur.[1]
[edit] References
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