Syngenite Mineral Data

General Syngenite Information

Chemical Formula:

K2Ca(SO4)2•(H2O)

Composition:

Molecular Weight = 328.42 gm

Potassium 23.81 % K 28.68 % K₂O

Calcium 12.20 % Ca 17.08 % CaO

Hydrogen 0.61 % H 5.49 % H₂O

Sulfur 19.53 % S 48.76 % SO₃

Oxygen 43.85 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂Ca(SO₄)₂•(H₂O)

Environment:

Diagenetic component of marine salt deposits.

IMA Status:

Valid Species (Pre-IMA) 1872

Locality:

Kalush salt deposit, Ukraine. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for related, for the chemical resemblance to polyhalite.

Name Pronunciation:

Syngenite + Pronunciation

Synonym:

ICSD 27748

PDF 28-739

Syngenite Image

Images:

Syngenite

Comments: Opaque platy crystal syngenite rosette on massive white halite.
Location: Sigmundshall Mine, Bokelch, Hannover, Niedersachsen, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Syngenite Crystallography

Axial Ratios:

a:b:c =1.3394:1:0.8415

Cell Dimensions:

a = 9.55, b = 7.13, c = 6, Z = 2; beta = 105° V = 394.63 Den(Calc)= 2.76

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 2.86(1), 3.16(0.75), 9.52(0.6),

Forms:

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Forms: ( 1 0 1) ( 3 1 0) ( 0 1 1) ( 1 0 0) ( 0 0 1)

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Crystal Structure:

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Corazza E , Sabelli C , Zeitschrift fur Kristallographie , 124 (1967) p.398-408, The crystal structure of syngenite, K2Ca(SO4)2*(H2O), Locality: Kalasz, Galicia

Physical Properties of Syngenite

Cleavage:

{???} Perfect

Color:

Colorless, White, Light yellow.

Density:

2.58

Diaphaneity:

Transparent to translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Syngenite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.059 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1854,KPDmeas= 0.1983,KC= 0.197
Ncalc = 1.51 - 1.54

Optical Data:

Biaxial (-), a=1.501, b=1.5166, g=1.5176, bire=0.0166, 2V(Calc)=28, 2V(Meas)=28.3. Dispersion relatively strong.

Calculated Properties of Syngenite

Electron Density:

Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Syngenite =2.58 gm/cc.

Fermion Index:

Fermion Index = 0.0018692654
Boson Index = 0.9981307346

Photoelectric:

PE_Syngenite= 5.05 barns/electron
U=PE_Syngenite x r_electron= 13.00 barns/cc.

Radioactivity:

GRapi = 343.09 (Gamma Ray American Petroleum Institute Units)
Concentration of Syngenite per GRapi unit = 0.29 (%)

Estimated Radioactivity from Syngenite - barely detectable

Syngenite Classification

Dana Class:

29.03.01.01 (29)Hydrated Acid and Sulfates

(29.03)where (A+)2 B (XO4)2 · x(H2O)

(29.03.01)Dana Group

29.03.01.01 Syngenite K2Ca(SO4)2•(H2O) P 2₁/m 2/m

29.03.01.02 Koktaite (NH4)2Ca(SO4)2•(H2O) P 2₁/m 2/m

Strunz Class:

07.CD.35 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CD -With only large cations

07.CD.35 Koktaite (NH4)2Ca(SO4)2•(H2O) P 2₁/m 2/m

07.CD.35 Syngenite K2Ca(SO4)2•(H2O) P 2₁/m 2/m

Other Syngenite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Syngenite :
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
15 - WWW-MINCRYST

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Ask about Syngenite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Syngenite Specimen Label here :

Syngenite

K2Ca(SO4)2•(H2O)
Dana No: 29.03.01.01 Strunz No: 07.CD.35
Locality:

Notes: