Syngenite Mineral Data

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)

IMA Status:

Valid Species (Pre-IMA) 1872

Locality:

Link to MinDat.org Location Data.

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:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: [ 1 0 1] [ 3 1 0] [ 0 1 1] [ 1 0 0] [ 0 0 1]

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaniety:

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

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:

r_electron=2.58 gm/cc
note: r_Syngenite=2.58 gm/cc.

Fermion Index

Fermion Index = 0.00186
Boson Index = 0.99814

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)

Estimated Radioactivity from Syngenite - barely detectable

Syngenite Classification

Dana Class:

29.3.1.1 (29)Hydrated Acid and Sulfates

(29.3)where (A+)2 B (XO4)2 · x(H2O)

(29.3.1)Dana Group

29.3.1.1 Syngenite K2Ca(SO4)2·(H2O) P 2₁/m 2/m

29.3.1.2 Koktaite (NH4)2Ca(SO4)2·(H2O) P 2₁/m 2/m

Strunz Class:

VI/C.21-60 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. Cations of very big size

VI/C.21 - Matteuccite - Mirabilite series

VI/C.21-10 Matteuccite NaHSO4·(H2O) Aa m

VI/C.21-20 Lecontite (NH4,K)Na(SO4)·2(H2O) P 2₁2₁2₁ 2 2 2

VI/C.21-30 Eugsterite Na4Ca(SO4)3·2(H2O) Unk. Mono

VI/C.21-40 Hydroglauberite Na4Ca(SO4)3·2(H2O) Unk. Ortho

VI/C.21-50 Wattevillite Na2Ca(SO4)2·4(H2O)(?) Unk Ortho

VI/C.21-60 Syngenite K2Ca(SO4)2·(H2O) P 2₁/m 2/m

VI/C.21-70 Koktaite (NH4)2Ca(SO4)2·(H2O) P 2₁/m 2/m

VI/C.21-80 Mirabilite Na2SO4·10(H2O) P 2₁/a 2/m

Other Syngenite Information

References:

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

Search for Syngenite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Syngenite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Syngenite Mineral Data :

Ask about Syngenite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
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: 29.3.1.1 Strunz No: VI/C.21-60
Locality:

Notes: