Rhomboclase Mineral Data (original) (raw)

General Rhomboclase Information

Help on Chemical Formula: Chemical Formula:

(H5O2)+Fe+++(SO4)2•2(H2O)

Help on Composition: Composition:

Molecular Weight = 321.04 gm

Iron 17.40 % Fe 24.87 % Fe2O3

Hydrogen 2.83 % H 25.25 % H2O

Sulfur 19.98 % S 49.88 % SO3

Oxygen 59.80 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

HFe3+(SO4)2•4(H2O)

Help on Environment: Environment:

Secondary mineral formed by alteration of pyrite, especially in an arid climate; typically of post-mining origin.

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1891

Help on Locality: Locality:

Smolnik (Szomolnok), 16 km northeast of Roznava, Slovakia. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named from the Greek for rhomb, for the typical rhombic crystal outline, and for to break, for its perfect cleavage.

Help on Name Pronunciation: Name Pronunciation:

Rhomboclase + Pronunciation Say RHOMBOCLASE

Help on Synonym: Synonym:

ICSD 4302

PDF 27-245

Rhomboclase Image

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

Rhomboclase Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.5314:1:0.2964

Help on Cell Dimensions: Cell Dimensions:

a = 9.723, b = 18.295, c = 5.424, Z = 4; V = 964.83 Den(Calc)= 2.21

Help on Crystal System: Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 3.113(1), 3.331(0.45), 4.05(0.45),

Help on Forms: Forms:

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

| | Forms:( 0 2 1) ( 0 1 0) ( 1 1 0) ( 1 1 1) ( 0 0 1) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Click Here for Large Rhomboclase Structure Window 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

| | Mereiter K , Tschermaks Mineralogische und Petrographische Mitteilungen , 21 (1974) p.216-232, Die kristallstruktur von rhomboklas, H5O2+{Fe[SO4]2*2H2O}-, Note: synthetic crystal View Additional jPOWD Structure files for Rhomboclase [1] | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Rhomboclase

Help on Cleavage: Cleavage:

{001} Perfect, {110} Good

Help on Color: Color:

Bluish, Colorless, Greenish, Gray, Yellow.

Help on Density: Density:

2.23

Help on Diaphaneity: Diaphaneity:

Transparent

Help on Fracture: Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Help on Hardness: Hardness:

2 - Gypsum

Help on Luster: Luster:

Vitreous - Pearly

Help on Streak: Streak:

white

Optical Properties of Rhomboclase

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= -0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2602,KPDmeas= 0.2578,KC= 0.2525
Ncalc = 1.56

Help on Optical Data: Optical Data:

Biaxial (+), a=1.534, b=1.553, g=1.638, bire=0.1040, 2V(Calc)=54, 2V(Meas)=27.

Calculated Properties of Rhomboclase

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.26 gm/cc
note: Specific Gravity of Rhomboclase =2.23 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.0054773418
Boson Index = 0.9945226582

Help on Photoelectric: Photoelectric:

PERhomboclase = 6.27 barns/electron
U=PERhomboclase x rElectron Density= 14.21 barns/cc.

Help on Radioactivity: Radioactivity:

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

Rhomboclase Classification

Help on Dana Class: Dana Class:

29.01.01.01 (29)Hydrated Acid and Sulfates

(29.01)(Hydrated, Acid)

(29.01.01)Dana Group

29.01.01.01 Rhomboclase (H5O2)Fe(SO4)2•2(H2O) P nma 2/m 2/m 2/m

Help on Strunz Class: Strunz Class:

07.CB.55 07 - SULFATES (SELENATES, TELLURATES)

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

07.CB -With only medium-sized cations

07.CB.55 Rhomboclase (H5O2)Fe(SO4)2•2(H2O) P nma 2/m 2/m 2/m

Other Rhomboclase Information

Help on References: References:

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

Help on See Also: See Also:

Links to other databases for Rhomboclase :
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

Search for Rhomboclase using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Rhomboclase :

A Bijoux Google Search for Rhomboclase
Adam's Minerals Google Search for Rhomboclase
Cape Minerals Google Search for Rhomboclase
Dakota Matrix Minerals Google Search for Rhomboclase
Excalibur Mineral Corp. Google Search for Rhomboclase
Exceptional Minerals Google Search for Rhomboclase
John Betts Fine Minerals Search for Rhomboclase
McDougall Minerals Google Search for Rhomboclase
Mineral News Website Link
Rock and Mineral Shows Google Search for Rhomboclase
Weinrich Minerals, Inc. Google Search for Rhomboclase

Ask about Rhomboclase 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 Espa�ol

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

Rhomboclase

(H5O2)+Fe+++(SO4)2•2(H2O)
Dana No: 29.01.01.01 Strunz No: 07.CB.55
Locality:

Notes: