Dellaventuraite Mineral Data

General Dellaventuraite Information

Chemical Formula:

NaNa2(Mg2,Mn+++,Li,Ti)Si8O22O2

Composition:

Molecular Weight = 859.87 gm

Potassium 1.82 % K 2.19 % K₂O

Sodium 6.20 % Na 8.36 % Na₂O

Lithium 0.73 % Li 1.56 % Li₂O

Calcium 1.35 % Ca 1.89 % CaO

Magnesium 5.12 % Mg 8.48 % MgO

Titanium 3.34 % Ti 5.57 % TiO₂

Manganese 5.43 % Mn 7.80 % Mn₂O₃

Aluminum 0.44 % Al 0.83 % Al₂O₃

Zinc 0.08 % Zn 0.09 % ZnO

Iron 4.61 % Fe 6.59 % Fe₂O₃

Silicon 26.00 % Si 55.62 % SiO₂

Nickel 0.14 % Ni 0.17 % NiO

Hydrogen 0.09 % H 0.84 % H₂O

Oxygen 44.66 % O

______ ______

100.00 % 100.02 % = TOTAL OXIDE

Empirical Formula:

K_0.4Na_0.61Na_1.71Ca_0.29Mg_1.81Zn_0.01Ni_0.02Li_0.9Fe³⁺_0.71Mn³⁺_0.85Ti_0.6Al_0.1Si_7.96Al_0.04 O₂₂(OH)_0.8O_1.2

Environment:

Occurs with leakeite, kornite, albite, braunite, and bixbyite associated with cross-cutting epigenetic veins that have reacted with regionally metamorphosed rocks containing Mn-rich minerals. Amphibole group

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

Kajlidongri manganese mine, Jhabua District, Madhya Pradesh, India. Link to MinDat.org Location Data.

Name Origin:

Named for Giancarlo Della Ventura, Universitï¿½ degli Studi di Roma Tre, for his extensive work on the crystal chemistry of synthetic amphiboles.

Synonym:

IMA2003-061

Dellaventuraite Image

Images:

Dellaventuraite Aegirine-augite

Comments: View in plane-polarized light of reddish brown dellaventuraite (OPTK) as an overgrowth on purple-gray aegirine-augite (AE-AG) in a matrix of rounded quartz (QZ) with minor rounded (high relief) apatite grains. (AmMin 90:306).
Location: Kajlidongri manganese mine, Jhabua District, Madhya Pradesh, India. Scale: Picture size 2.5 cm.
© American Mineralogist

Dellaventuraite Crystallography

Axial Ratios:

a:b:c =0.5497:1:0.2962

Cell Dimensions:

a = 9.808, b = 17.84, c = 5.2848, Z = 2; beta = 104.653° V = 894.63 Den(Calc)= 3.19

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.697(1)(151), 2.542(0.9)(202), 3.127(0.8)(310),1.434(0.7)(661), 2.154(0.7)(261), 3.378(0.7)(131), 4.45(0.6)(021), 8.459(0.5)(110),

Physical Properties of Dellaventuraite

Cleavage:

{110} Perfect, {110} Perfect

Color:

Pikish red.

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

pale pink

Optical Properties of Dellaventuraite

Gladstone-Dale:

CI calc= 0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2195,KC= 0.2328
Ncalc = 1.74

Optical Data:

Biaxial (+), a=1.687-1.689, b=1.69-1.694, g=1.72-1.722, bire=0.0330

Calculated Properties of Dellaventuraite

Electron Density:

Bulk Density (Electron Density)=3.14 gm/cc
note: Specific Gravity of Dellaventuraite =3.19 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Dellaventuraite}= 4.95 barns/electron
U=PE_{Dellaventuraite} x r_electron= 15.54 barns/cc.

Radioactivity:

GRapi = 25.83 (Gamma Ray American Petroleum Institute Units)
Concentration of Dellaventuraite per GRapi unit = 3.87 (%)

Estimated Radioactivity from Dellaventuraite - barely detectable

Dellaventuraite Classification

Dana Class:

66.01.03c.17 (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.01)with P=2 amphibole configuration

(66.01.03c)Group 4, the sodic amphiboles

66.01.03c.01 Glaucophane []Na2(Mg3Al2)Si8O22(OH)2 C 2/m 2/m

66.01.03c.02 Ferroglaucophane []Na2(Fe3Al2)Si8O22(OH)2 C 2/m 2/m

66.01.03c.03 Crossite? Na2(Mg,Fe)3(Al,Fe)2Si8O22(OH)2 C 2/m 2/m

66.01.03c.04 Magnesioriebeckite []Na2[(Mg,Fe)3Fe2]Si8O22(OH)2 C 2/m 2/m

66.01.03c.05 Riebeckite []Na2(Fe3Fe2)Si8O22(OH)2 C 2/m 2/m

66.01.03c.06 Eckermannite NaNa2(Mg4Al)Si8O22(OH)2 C 2/m 2/m

66.01.03c.07 Ferro-eckermannite NaNa2(Fe4Al)Si8O22(OH)2 C 2/m 2/m

66.01.03c.08 Magnesio-arfvedsonite NaNa2(Mg4Fe)Si8O22(OH)2 C 2/m 2/m

66.01.03c.09 Arfvedsonite NaNa2(Fe4Fe)Si8O22(OH)2 C 2/m 2/m

66.01.03c.09a Fluoro-magnesio-arfvedsonite! NaNa2(Mg,Fe)4Fe[Si8O22](F,OH)2 C 2/m 2/m

66.01.03c.09b Potassicarfvedsonite! KNa2Fe4FeSi8O22(OH)2 C 2/m 2/m

66.01.03c.10 Kozulite NaNa2Mn4(Fe,Al)Si8O22(OH)2 C 2/m 2/m

66.01.03c.11 Nyboite NaNa2(Mg3Al2)Si7AlO22(OH)2 C 2/m 2/m

66.01.03c.11a Ferronyboite! NaNa2(Fe)3Al2(Si7Al)O22(OH)2 C 2/m 2/m

66.01.03c.11b Ferric-ferronyboite! NaNa2(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m

66.01.03c.11c Fluoronyboite! NaNa2(Al2Mg3)(Si7Al)O22(F,OH)2 C 2/m 2/m

66.01.03c.12 Leakeite NaNa2(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m

66.01.03c.12a Ferroleakeite! NaNa2(Fe)3(Fe)2Li(Si8O22)(OH)2 C 2/m 2/m

66.01.03c.12b Potassicleakeite! KNa2Mg2Fe2LiSi8O22(OH)2 C 2/m 2/m

66.01.03c.13 Kornite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m

66.01.03c.14 Ungarettiite NaNa2(Mn2Mn3)Si8O22O2 C 2/m 2/m

66.01.03c.15 Fluoro-ferroleakeite NaNa2(Fe2Fe2Li)Si8O22F2 C 2/m 2/m

66.01.03c.16 Obertiite! NaNa2(Mg3FeTi)Si8O22(O,F,OH)2 C 2/m 2/m

66.01.03c.17 Dellaventuraite! NaNa2(Mg2,Mn,Li,Ti)Si8O22O2 C 2/m 2/m

Strunz Class:

09.DE.25 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family

09.DE.25 Arfvedsonite NaNa2(Fe4Fe)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Ferroglaucophane []Na2(Fe3Al2)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Crossite? Na2(Mg,Fe)3(Al,Fe)2Si8O22(OH)2 C 2/m 2/m

09.DE.25 Eckermannite NaNa2(Mg4Al)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Glaucophane []Na2(Mg3Al2)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Fluoro-ferroleakeite NaNa2(Fe2Fe2Li)Si8O22F2 C 2/m 2/m

09.DE.25 Ferro-eckermannite NaNa2(Fe4Al)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Ferroleakeite! NaNa2(Fe)3(Fe)2Li(Si8O22)(OH)2 C 2/m 2/m

09.DE.25 Ferronyboite! NaNa2(Fe)3Al2(Si7Al)O22(OH)2 C 2/m 2/m

09.DE.25 Ferric-ferronyboite! NaNa2(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m

09.DE.25 Obertiite! NaNa2(Mg3FeTi)Si8O22(O,F,OH)2 C 2/m 2/m

09.DE.25 Nyboite NaNa2(Mg3Al2)Si7AlO22(OH)2 C 2/m 2/m

09.DE.25 Magnesioriebeckite []Na2[(Mg,Fe)3Fe2]Si8O22(OH)2 C 2/m 2/m

09.DE.25 Kozulite NaNa2Mn4(Fe,Al)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Kornite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m

09.DE.25 Leakeite NaNa2(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Magnesio-arfvedsonite NaNa2(Mg4Fe)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Ungarettiite NaNa2(Mn2Mn3)Si8O22O2 C 2/m 2/m

09.DE.25 Riebeckite []Na2(Fe3Fe2)Si8O22(OH)2 C 2/m 2/m

09.DE.25 Potassicleakeite! KNa2Mg2Fe2LiSi8O22(OH)2 C 2/m 2/m

09.DE.25 Fluoronyboite! NaNa2(Al2Mg3)(Si7Al)O22(F,OH)2 C 2/m 2/m

09.DE.25 Fluoro-magnesio-arfvedsonite! NaNa2(Mg,Fe)4Fe[Si8O22](F,OH)2 C 2/m 2/m

09.DE.25 Potassicarfvedsonite! KNa2Fe4FeSi8O22(OH)2 C 2/m 2/m

09.DE.25 Dellaventuraite! NaNa2(Mg2,Mn,Li,Ti)Si8O22O2 C 2/m 2/m

Other Dellaventuraite Information

References:

NAME( AmMin 90:304) PHYS. PROP.(AmMin 90:304) OPTIC PROP.(AmMin 90:304)

See Also:

Links to other databases for Dellaventuraite :
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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Print or Cut-and-Paste your Dellaventuraite Specimen Label here :

Dellaventuraite

NaNa2(Mg2,Mn+++,Li,Ti)Si8O22O2
Dana No: 66.01.03c.17 Strunz No: 09.DE.25
Locality:

Notes:

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