Crossite Mineral Data (original) (raw)

General Crossite Information

Help on Chemical Formula: Chemical Formula:

Na2(Mg,Fe++)3(Al,Fe+++)2Si8O22(OH)2

Help on Composition: Composition:

Molecular Weight = 795.32 gm

Sodium 5.78 % Na 7.79 % Na2O

Magnesium 6.11 % Mg 10.14 % MgO

Aluminum 2.54 % Al 4.81 % Al2O3

Iron 8.78 % Fe 9.03 % FeO / 2.51 % Fe2O3

Silicon 28.25 % Si 60.44 % SiO2

Hydrogen 0.25 % H 2.27 % H2O

Oxygen 48.28 % O

______ ______

100.00 % 96.98 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Na2Mg2Fe2+Al0.75Fe3+0.25(Si8O22)(OH)2

Help on Environment: Environment:

High pressure, low temperature metamorphic mineral. Discredited by IMA amphibole subcommittee (now glaucophane or ferroglaucophane or magnesioriebeckite or riebeckite).

Help on IMA Status: IMA Status:

Discredited IMA 1997 - Valid Species (Pre-IMA) 1894

Help on Locality: Locality:

Berkeley, Conta Costa Co., USA. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named in 1894 for Charles Whitman Cross, (1854-1949), geologist, United States Geological Survey.

Help on Synonym: Synonym:

Discredited

ICSD 27459

PDF 20-376

Crossite Image

Click Here for Larger Crossite Image in a New Browser Window Images:

Click Here for Larger Crossite Image in a New Browser Window Images:

Click Here for Larger Crossite Image Crossite Comments: Long metallic, black, prismatic crystals or crossite on matrix. Location: Webbing, Lammertal, Salzburg, Austria.Scale: Picture size 2.5 mm. © Tom Loomis / Dakota Matrix

Crossite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.5387:1:0.2969

Help on Cell Dimensions: Cell Dimensions:

a = 9.647, b = 17.905, c = 5.316, Z = 2; beta = 103.6° V = 892.48 Den(Calc)= 2.96

Help on Crystal System: Crystal System:

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

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 8.31(1), 3.08(0.7), 2.71(0.4),2.53(0.2), 3.4(0.2), 4.48(0.2), 4.87(0.2), 8.95(0.1),

Physical Properties of Crossite

Help on Cleavage: Cleavage:

{110} Perfect, {010} Good

Help on Color: Color:

Blue, Gray, Gray blue.

Help on Density: Density:

3.16

Help on Diaphaneity: Diaphaneity:

Transparent to translucent

Help on Fracture: Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Help on Habit: Habit:

Tabular - Form dimensions are thin in one direction.

Help on Hardness: Hardness:

6 - Orthoclase

Help on Luminescence: Luminescence:

Non-fluorescent.

Help on Luster: Luster:

Vitreous (Glassy)

Help on Streak: Streak:

white

Optical Properties of Crossite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= -0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.089 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2214,KPDmeas= 0.2074,KC= 0.2033
Ncalc = 1.6 - 1.64

Help on Optical Data: Optical Data:

Biaxial (-), a=1.64-1.659, b=1.645-1.666, g=1.652-1.67, bire=0.0110-0.0120, 2V(Calc)=72-82, 2V(Meas)=12-65. Dispersion very strong, r > v.

Help on Pleochroism (x): Pleochroism (x):

wine yellow, pale yellow, colorless, or pale mauve blue.

Help on Pleochroism (y): Pleochroism (y):

blue, prussian blue, purplish blue, or deep blue.

Help on Pleochroism (z): Pleochroism (z):

grayish violet, violet, blue, or deep mauve blue.

Calculated Properties of Crossite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=3.13 gm/cc
note: Specific Gravity of Crossite =3.16 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Help on Photoelectric: Photoelectric:

PECrossite = 3.98 barns/electron
U=PECrossite x rElectron Density= 12.48 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Crossite is Not Radioactive

Crossite Classification

Help on Dana Class: Dana Class:

66.01.03c.03 (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

Help on Strunz Class: 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 Crossite Information

Help on References: References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana)

Help on See Also: See Also:

Links to other databases for Crossite :
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 (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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

Crossite

Na2(Mg,Fe++)3(Al,Fe+++)2Si8O22(OH)2
Dana No: 66.01.03c.03 Strunz No: 09.DE.25
Locality:

Notes: