Direnzoite Mineral Data

General Direnzoite Information

Chemical Formula:

NaK6MgCa2(Al13Si47O120)•36H2O

Composition:

Molecular Weight = 4,597.25 gm

Potassium 4.02 % K 4.85 % K₂O

Barium 0.03 % Ba 0.03 % BaO

Sodium 0.56 % Na 0.75 % Na₂O

Strontium 0.06 % Sr 0.07 % SrO

Calcium 1.89 % Ca 2.65 % CaO

Magnesium 0.82 % Mg 1.37 % MgO

Aluminum 7.86 % Al 14.86 % Al₂O₃

Iron 0.18 % Fe 0.23 % FeO

Silicon 28.70 % Si 61.40 % SiO₂

Hydrogen 1.58 % H 14.10 % H₂O

Oxygen 54.29 % O

______ ______

100.00 % 100.31 % = TOTAL OXIDE

Empirical Formula:

Na_1.12K_4.73Mg_1.56Ca_2.17Fe²⁺_0.15Sr_0.03Ba_0.01Al_13.4Si_46.98O₁₂₀ï¿½35.99(H₂O)

Environment:

Inside the cavities of a piece of xenolith rock incorporated by alkaline volcanic rocks, Zeolite group

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Mont Peylenc, near the town of St. Pierre Eynac, Massif Central, France Link to MinDat.org Location Data.

Name Origin:

Named for Francesco Di Renzo (b1954), Research Director at the Laboratoire de Materiaux Catalytiques et Catalyse en Chimie Organique, Ecole Nationale Superieure de Chimie de Montpel lier (France),

Synonym:

IMA2006-044

Direnzoite Image

Images:

Direnzoite

Comments: A fragment of the original piece of xenolith that containes direnzoite specimen. AmMin v93:96.
Location: Massif Central (France). Scale: Sample size 4 cm.
© American Mineralogist

Images:

Direnzoite

Comments: SEM micrograph of direnzoite showing the internal radial fiberous structure of the nodule. (AmMin, v93:97.
Location: Massif Central (France). Scale: See Image.
© American Mineralogist

Direnzoite Crystallography

Axial Ratios:

a:b:c =0.4164:1:1.4369

Cell Dimensions:

a = 7.5789, b = 18.201, c = 26.1539, Z = 1; V = 3,607.76 Den(Calc)= 2.12

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmmn

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

By Intensity(I/I_o): 3.182(1), 3.484(0.71), 9.077(0.604),3.269(0.55), 2.907(0.48), 3.549(0.47), 4.234(0.44), 7.846(0.41),

Physical Properties of Direnzoite

Cleavage:

{010} Distinct

Color:

White.

Density:

2.12

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Direnzoite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2278,KPDmeas= 0.2278,KC= 0.2262
Ncalc = 1.48

Optical Data:

Biaxial (?), a=1.483, b=1.483, g=1.483, bire=0.0000

Calculated Properties of Direnzoite

Electron Density:

Bulk Density (Electron Density)=2.14 gm/cc
note: Specific Gravity of Direnzoite =2.12 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Direnzoite= 2.25 barns/electron
U=PE_Direnzoite x r_electron= 4.81 barns/cc.

Radioactivity:

GRapi = 58.63 (Gamma Ray American Petroleum Institute Units)
Concentration of Direnzoite per GRapi unit = 1.71 (%)

Estimated Radioactivity from Direnzoite - barely detectable

Direnzoite Classification

Dana Class:

77.01.06.12 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.06)Mordenite and related species

77.01.06.01 Mordenite (Ca,Na2,K2)Al2Si10O24•7(H2O) C mc2₁ mm2

77.01.06.02 Epistilbite CaAl2Si6O16•5(H2O) C1 1

77.01.06.03 Maricopaite Pb7Ca2(Si,Al)48O100•32(H2O) Cm2m 2/m 2/m 2/m

77.01.06.04 Dachiardite-Ca (Ca,Na2,K2)5Al10Si38O96•25(H2O) C 2/m 2/m

77.01.06.05 Dachiardite-Na (Na2,Ca,K2)4Al4Si20O48•13(H2O) C 2/m 2/m

77.01.06.06 Ferrierite-Mg (Mg,Na,K)2Mg(Si,Al)18O36•9(H2O) Pnnm 2/m 2/m 2/m

77.01.06.06a Ferrierite-K! (K,Na)2Mg(Si,Al)18O36•9(H2O) Pnnm 2/m 2/m 2/m

77.01.06.06b Ferrierite-Na! (Na,K)2Mg(Si,Al)18O36•9(H2O) P 2₁/n 2/m

77.01.06.07 Boggsite NaCa2(Al5Si19O48)•17(H2O) I mma 2/m 2/m 2/m

77.01.06.08 Gottardiite! Na3Mg3Ca5Al19Si117O272•93(H2O) C mca 2/m 2/m 2/m

77.01.06.09 Terranovaite! (Na,Ca)8(Si68Al12)O160•29(H2O) C mcm 2/m 2/m 2/m

77.01.06.10 Mutinaite! Na3Ca4Si85Al11O192•60(H2O) P nma 2/m 2/m 2/m

77.01.06.12 Direnzoite! NaK6MgCa2(Al13Si47O120)•36H2O Pmmn 2/m 2/m 2/m

Strunz Class:

09.GF.55 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GF -Other Rare Zeolites

09.GF.55 Direnzoite! NaK6MgCa2(Al13Si47O120)•36H2O Pmmn 2/m 2/m 2/m

Other Direnzoite Information

References:

NAME( AmMin, v93:95) PHYS. PROP.(AmMin, v93:95) OPTIC PROP.(AmMin, v93:95)

See Also:

Links to other databases for Direnzoite :
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

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Direnzoite

NaK6MgCa2(Al13Si47O120)•36H2O
Dana No: 77.01.06.12 Strunz No: 09.GF.55
Locality:

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