Title: Fichtelite
CAS Registry Number: 2221-95-6
CAS Name: [1S-(1a,4aa,4bb,7b,8aa,10ab)]-Tetradecahydro-1,4a-dimethyl-7-(1-methylethyl)phenanthrene
Additional Names: 18-norabietane
Molecular Formula: C19H34
Molecular Weight: 262.47
Percent Composition: C 86.94%, H 13.06%
Literature References: From decayed wood of conifers: Bromeis, Ann. Pharm. 37, 304 (1841). Structure: L. Ruzicka, E. Waldmann, Helv. Chim. Acta 18, 611 (1935); Crowfoot, J. Chem. Soc. 1938, 1241. Stereochemistry: Burgstahler, Marx, Tetrahedron Lett. 1964, 3333. Synthesis from abietic acid: Jensen, Johnson, J. Org. Chem. 32, 2045 (1967); Burgstahler, Marx, ibid. 34, 1562 (1969). Synthesis of dl-form: Johnson et al., J. Am. Chem. Soc. 88, 3859 (1966); 90, 5872 (1968); D. F. Taber, S. A. Saleh, ibid. 102, 5085 (1980).
Properties: Crystals from methanol, mp 45-46°. bp43 235-236°. d422 0.9380. nD20 1.5052. [a]D +19°.
Melting point: mp 45-46°
Boiling point: bp43 235-236°
Optical Rotation: [a]D +19°
Index of refraction: nD20 1.5052
Density: d422 0.9380
Ficin Fidarestat Filicinic Acid Filipin Filixic Acids

Category Organic mineral
(repeating unit)
Strunz classification 10.BA.05 Hydrocarbons
Dana classification
Color Colorless, white, pale yellow
Crystal habit Elongated tabular crystals
Crystal system Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 21
Cleavage Good on {001} and {100}
Mohs scale hardness 1
Luster Greasy
Streak White
Diaphaneity Transparent
Specific gravity 0.631 calculated[1] 1.032[2]
Optical properties Biaxial
Melting point 44.2 °C – 45.0 °C
References [1][2][3]

Fichtelite is a rare white mineral found in fossilized wood from Bavaria. It crystallizes in the monoclinic crystal system. It is a cyclic hydrocarbon dimethyl-isopropyl-perhydrophenanthrene, C19H34. It is very soft with a Mohs hardness of 1, the same as talc. Its specific gravity is very low at 1.032, just slightly denser than water.

It was first described in 1841 and named for the location, Fichtelgebirge, Bavaria, Germany.[3] It has been reported from fossilized pine wood from a peat bog and in organic-rich modern marine sediments.[1]