Kemmlitzite Mineral Data

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General Kemmlitzite Information

Chemical Formula:

(Sr,Ce)Al3(AsO4)(SO4)(OH)6

Composition:

Molecular Weight = 517.07 gm

Strontium 6.78 % Sr 8.02 % SrO

Calcium 0.78 % Ca 1.08 % CaO

Cerium 10.84 % Ce 12.70 % Ce₂O₃

Magnesium 0.47 % Mg 0.78 % MgO

Aluminum 14.61 % Al 27.61 % Al₂O₃

Iron 1.08 % Fe 1.54 % Fe₂O₃

Silicon 1.09 % Si 2.32 % SiO₂

Arsenic 14.49 % As 22.23 % As₂O₅

Phosphorus 2.40 % P 5.49 % P₂O₅

Hydrogen 1.36 % H 12.19 % H₂O

Sulfur 2.48 % S 6.19 % SO₃

Oxygen 43.63 % O

______ ______

100.00 % 100.15 % = TOTAL OXIDE

Empirical Formula:

Sr_0.4Ce_0.4Mg_0.1Ca_0.1Al_2.8Fe³⁺_0.1(AsO₄)(PO₄)_0.4(SO₄)_0.4(SiO₄)_0.2(OH)_5.2·0.9(H₂O)

Environment:

Kaolinized quartz porphyry, in the heavy mineral fraction.

IMA Status:

Approved IMA 1969

Locality:

Kemmlitz kaolin depoosit, near Oschatz, Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Kemmlitzite + Pronunciation

Kemmlitzite Image

Images:

Kemmlitzite

Comments: Tan granular kemmlitzite in sand.
Location: Kemmlitz Deposit, Oschatz, Sachsen, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Kemmlitzite Crystallography

Axial Ratios:

a:c = 1:2.33455

Cell Dimensions:

a = 7.072, c = 16.51, Z = 3; V = 715.09 Den(Calc)= 3.60

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.959(1), 1.903(0.9), 3.514(0.9),

Physical Properties of Kemmlitzite

Cleavage:

{0001} Poor

Color:

Colorless, Gray brown, Light brown.

Density:

3.63

Diaphaneity:

Transparent to Translucent

Habit:

Pseudo Rhombohedral - Crystals show a rhombohedral outline.

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Kemmlitzite

Gladstone-Dale:

CI meas= 0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1956,KPDmeas= 0.1939,KC= 0.1991
Ncalc = 1.72

Optical Data:

Uniaxial (+), w=1.701, e=1.707, bire=0.0060.

Calculated Properties of Kemmlitzite

Electron Density:

Bulk Density (Electron Density)=3.46 gm/cc
note: Specific Gravity of Kemmlitzite =3.60 gm/cc.

Fermion Index:

Fermion Index = 0.0063590884
Boson Index = 0.9936409116

Photoelectric:

PE_Kemmlitzite= 70.48 barns/electron
U=PE_Kemmlitzite x r_electron= 243.97 barns/cc.

Radioactivity:

GRapi = 11,117.58 (Gamma Ray American Petroleum Institute Units)
Concentration of Kemmlitzite per GRapi unit = 89.95 (PPM)

Kemmlitzite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Kemmlitzite** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 8.10 cm	242,798	6.56E-06	11,117.58	3.66
100 gm / 3.76 cm	24,280	6.56E-07	1,111.76	0.37
10 gm / 1.74 cm	2,428	6.56E-08	111.18	0.04
1 gm / 8.10 mm	243	6.56E-09	11.12	0.00
0.1 gm / 3.76 mm	24	6.56E-10	1.11	0.00
0.01 gm / 1.74 mm	2	6.56E-11	0.11	0.00
0.001 gm / 0.81 mm	0	6.56E-12	0.01	0.00

Weight of pure Kemmlitzite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.60 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.54 % Th) From Sum REE Elements (10.84 % REE)

Kemmlitzite Classification

Dana Class:

43.04.01.07 (43)Compound Phosphates, etc.

(43.04)(Anhydrous Compound Anions With Hydroxyl or Halogen)

(43.04.01)Beudantite Group

43.04.01.01 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.02 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m

43.04.01.03 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.04 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3m 3 2/m

43.04.01.05 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.06 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.07 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.08 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.09 Weilerite BaAl3H[(As,P)O4]2(OH)6 R 3m 3 2/m

43.04.01.10 Gallobeudantite! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m

Strunz Class:

08.BL.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1

08.BL.05 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m

08.BL.05 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Gallobeudantite! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m

08.BL.05 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3m 3 2/m

08.BL.05 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Weilerite BaAl3H[(As,P)O4]2(OH)6 R 3m 3 2/m

08.BL.05 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

Other Kemmlitzite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Kemmlitzite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Kemmlitzite

(Sr,Ce)Al3(AsO4)(SO4)(OH)6
Dana No: 43.04.01.07 Strunz No: 08.BL.05
Locality:

Notes: