General Jahnsite-(CaMgMg) Information![]() CaMgMg2Fe+++2(PO4)4(OH)2•8H2O |
![]() Molecular Weight = 782.71 gm |
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Calcium 5.12 % Ca 7.16 % CaO |
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Magnesium 9.32 % Mg 15.45 % MgO |
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Iron 14.27 % Fe 20.40 % Fe2O3 |
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Phosphorus 15.83 % P 36.27 % P2O5 |
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Hydrogen 2.32 % H 20.71 % H2O |
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Oxygen 53.15 % O |
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100.00 % 100.00 % = TOTAL OXIDE |
![]() CaMg3Fe3+2(PO4)4(OH)2•8(H2O) |
![]() Zoned tip on Jahnsite-(NaFeMg). Whiteite-jahnsite group. |
![]() Not Submitted IMA (Dana # Added) |
![]() Tip Top mine, Custer County, South Dakota, USA. Link to MinDat.org Location Data. |
![]() Named for Richard H. Jahns (1915-1983), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA. |
![]() Jahnsite-(CaMgMg) |
![]() ![]() IMA2007-016 |
| | Search for Jahnsite-(CaMgMg) Images
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| | Jahnsite-(CaMgMg) Crystallography![]() Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/a |
| Physical Properties of Jahnsite-(CaMgMg)![]() Yellow. |
![]() 2.58 |
![]() Transparent |
![]() Brittle - Splintery - Brittle fracture leaving splintery fragments. |
![]() Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
![]() Striated - Parallel lines on crystal surface or cleavage face. |
![]() 4 - Fluorite |
![]() Vitreous (Glassy) |
![]() white |
| Optical Properties of Jahnsite-(CaMgMg)![]() Biaxial (-) |
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NCalc= 1.64 - from Gladstone-Dale relationship (KC = 0.247) where Ncalc=Dmeas*KC+1 |
| Calculated Properties of Jahnsite-(CaMgMg)![]() Bulk Density (Electron Density)=2.60 gm/cc |
note: Specific Gravity of Jahnsite-(CaMgMg) =2.58 gm/cc. ![]() Fermion Index = 0.01 |
Boson Index = 0.99 ![]() PEJahnsite-(CaMgMg) = 5.77 barns/electron |
U=PEJahnsite-(CaMgMg) x rElectron Density= 14.99 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Jahnsite-(CaMgMg) is Not Radioactive | Jahnsite-(CaMgMg) Classification![]() 42.11.03.07 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.11)where (AB)4 (XO4)3 Zq · x(H2O) |
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(42.11.03)Whiteite Group |
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![]() 08.DH.15 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.D - Phosphates, etc |
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08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1 |
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| Other Jahnsite-(CaMgMg) Information![]() NAME( AmMin, v93:940) PHYS. PROP.(AmMin, v93:940) OPTIC PROP.(AmMin, v93:940) |
![]() Links to other databases for Jahnsite-(CaMgMg) : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - GeoScienceWorld 4 - Google Images 5 - Google Scholar 6 - MinDAT 7 - Mineralienatlas (Deutsch) 8 - Online Mineral Museum 9 - QUT Mineral Atlas 10 - Ruff.Info Search for Jahnsite-(CaMgMg) using: Visit our Advertisers for Jahnsite-(CaMgMg) : A Bijoux Google Search for Jahnsite-(CaMgMg)Adam's Minerals Google Search for Jahnsite-(CaMgMg) Cape Minerals Google Search for Jahnsite-(CaMgMg) Dakota Matrix Minerals Google Search for Jahnsite-(CaMgMg) Excalibur Mineral Corp. Google Search for Jahnsite-(CaMgMg) Exceptional Minerals Google Search for Jahnsite-(CaMgMg) John Betts Fine Minerals Search for Jahnsite-(CaMgMg) McDougall Minerals Google Search for Jahnsite-(CaMgMg) Mineral News Website Link Rock and Mineral Shows Google Search for Jahnsite-(CaMgMg) Weinrich Minerals, Inc. Google Search for Jahnsite-(CaMgMg) Ask about Jahnsite-(CaMgMg) here : Print or Cut-and-Paste your Jahnsite-(CaMgMg) Specimen Label here :
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