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Charlesite Mineral Data

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General Charlesite Information

Help on Chemical  Formula: Chemical Formula: Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)
Help on Composition: Composition: Molecular Weight = 1,234.40 gm
   Calcium   19.48 %  Ca   27.26 % CaO
   Aluminum   3.28 %  Al    6.19 % Al2O3
   Silicon    1.14 %  Si    2.43 % SiO2
   Boron      0.88 %  B     2.82 % B2O3
   Hydrogen   5.23 %  H    46.70 % H2O
   Sulfur     5.20 %  S    12.97 % SO3
   Oxygen    64.81 %  O
            ______        ______ 
            100.00 %       98.38 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca6Al1.5Si0.5(SO4)2B(OH)12O4•26(H2O)
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: 800 level close to the Palmer shaft, Franklin, Sussex County, New Jersey. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Charles Palache (1869-1954), professor of mineralogy, Harvard University.

Charlesite Image

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Comments: 1 cm white crystal of charlesite on calcite with small (2 mm) octahedral crystals of galena.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: Picture size 2.5 cm.
© John Veevaert

Charlesite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.90053
Help on Cell Dimensions: Cell Dimensions: a = 11.16, c = 21.21, Z = 2; V = 2,287.70 Den(Calc)= 1.79
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: P 31c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.67(1), 5.58(0.7), 3.89(0.7),2.58(0.6), 2.22(0.5), 2.77(0.5), 2.16(0.4), 4.75(0.2),

Physical Properties of Charlesite

Help on Cleavage: Cleavage: {1010} Perfect
Help on Color: Color: Colorless, Light yellow, Pink.
Help on Density: Density: 1.77
Help on Diaphaneity: Diaphaneity: Translucent to transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Weakly Fluorescent, Short UV=light violet or green, Long UV=light violet or green.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Charlesite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.039 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2701,KPDmeas= 0.2732,KC= 0.2629
Ncalc = 1.47
Help on Optical Data: Optical Data: Uniaxial (-), e=1.475, w=1.492, bire=0.0170.

Calculated Properties of Charlesite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.88 gm/cc
note: Specific Gravity of Charlesite =1.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0032455117
Boson Index = 0.9967544883
Help on Photoelectric: Photoelectric: PECharlesite = 2.89 barns/electron
U=PECharlesite x rElectron Density= 5.43 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Charlesite is Not Radioactive

Charlesite Classification

Help on  Dana Class: Dana Class: (32)Compound Sulfates
  (32.04)(hydrous) with poly-anionic formula
  (32.04.04)Charlesite Group Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O) P 31c 3m Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12•25(H2O) P 31c 3m Jouravskite Ca3Mn(SO4,CO3)2(OH)6•12(H2O) P 63/m 6/m Thaumasite Ca3Si(CO3)(SO4)(OH)6•12(H2O) P 63/m 6/m Carraraite! Ca3Ge(OH)6(SO4)(CO3)•12H2O P 63/m, or P 63 Hex
Help on  Strunz Class: Strunz Class: 07.DG.15 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DG -With large and medium sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
07.DG.15 Bentorite Ca6(Cr,Al)2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m
07.DG.15 Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O) P 31c 3m
07.DG.15 Ettringite Ca6Al2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m
07.DG.15 Jouravskite Ca3Mn(SO4,CO3)2(OH)6•12(H2O) P 63/m 6/m
07.DG.15 Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12•25(H2O) P 31c 3m
07.DG.15 Thaumasite Ca3Si(CO3)(SO4)(OH)6•12(H2O) P 63/m 6/m
07.DG.15 Buryatite! Ca3(Si,Fe,Al)[SO4][B(OH)4](OH,O)6•12(H2O) P 31c 3m
07.DG.15 Carraraite! Ca3Ge(OH)6(SO4)(CO3)•12H2O P 63/m, or P 63 Hex

Other Charlesite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Charlesite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: Strunz No: 07.DG.15





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