Johnbaumite
In the world of Johnbaumite, there has always been significant and varied interest. Whether we are talking about a person's life, a current topic, or a historical event, Johnbaumite has captured the imagination of many people over the years. In this article, we will explore Johnbaumite in depth and examine its impacts, relevance, and how it has influenced different aspects of society. From its origin to its evolution today, Johnbaumite has left an indelible mark on the world, and it is essential to understand its importance to appreciate its meaning in our daily lives.
| Johnbaumite | |
|---|---|
 | |
| General | |
| Category | Apatite group |
| Formula (repeating unit) | Ca5(AsO4)3OH |
| IMA symbol | Jbm |
| Strunz classification | 08.BN.05 |
| Dana classification | 41.08.03.03 |
| Crystal system | Hexagonal |
| Crystal class | Dipyramidal (8/m) |
| Space group | P63/m |
| Identification | |
| Colour | Greyish white to colourless |
| Crystal habit | Anhedral grains, granular minerals without the expression of crystal shapes and massive, uniformly indistinguishable crystals forming large masses. |
| Cleavage | Distinct {1010} |
| Fracture | Irregular/Uneven |
| Tenacity | Brittle |
| Mohs scale hardness | ≈ 4.5 |
| Luster | Adamantine to greasy on fracture surfaces, vitreous on cleavage surfaces |
| Streak | White |
| Diaphaneity | Transparent |
| Density | 3.65 – 3.73 g/cm3 |
| Optical properties | Uniaxial (−) |
| Refractive index | nω = 1.687 nε = 1.684 |
| Birefringence | 0.003 |
| Pleochroism | Non-pleochroic |
| Extinction | Parallel |
| References | |
Johnbaumite is a calcium arsenate hydroxide mineral. It was first described in 1980, where it appeared in Franklin Township, Somerset County, New Jersey. Johnbaumite was discovered at Harstigen mine in Sweden in the 19th century, but it was described as svabite.
Etymology
It is named after geologist John Leach Baum (March 15, 1916 – October 16, 2011), who found the original specimen in 1944. He was a significant contributor to the geology and mineralogy of the Franklin deposit, and the Curator Emeritus at the Franklin Mineral Museum.
See also
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ "Johnbaumite". webmineral.com. Retrieved 17 June 2022.
- ^ "Johnbaumite". Mindat.org. Retrieved 17 June 2022.
- ^ Pete J. Dunn, Donald R. Peacor, Nancy Newberry; Johnbaumite, a new member of the apatite group from Franklin, New Jersey. American Mineralogist 1980;; 65 (11–12): 1143–1145. doi:
- ^ Cristian Biagioni, Marco Pasero; The crystal structure of johnbaumite, Ca5(AsO4)3OH, the arsenate analogue of hydroxylapatite. American Mineralogist 2013;; 98 (8–9): 1580–1584. doi: https://doi.org/10.2138/am.2013.4443
Further reading
- Biagioni C, Bosi F, Hålenius U, Pasero M (2017) The crystal structure of turneaureite, Ca5(AsO4)3Cl, the arsenate analog of chlorapatite, and its relationships with the arsenate apatites johnbaumite and svabite, American Mineralogist, 102, 1981–1986
- Lee Y J, Stephens P W, Tang Y, Li W, Phillips B L, Parise J B, Reeder R J (2009) Arsenate substitution in hydroxylapatite: Structural characterization of the Ca5(PxAs1-xO4)3OH solid solution, American Mineralogist, 94, 666–675
- Zheng Y, Gao T, Gong Y, Ma S, Yang M, Chen P (2015) Electronic, vibrational and thermodynamic properties of Ca10(AsO4)6(OH)2: first principles study, The European Physical Journal of Applied Physics, 72, 1–7
- Anthony J W, Bideaux R A, Bladh K W, and Nichols M C (1990) Handbook of Mineralogy, Mineral Data Publishing, Tucson Arizona, USA, by permission of the Mineralogical Society of America.