Ribbeite (original) (raw)
A valid IMA mineral species
About RibbeiteHide
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Formula:
Mn2+5(SiO4)2(OH)2
Mn may be replaced by minor Mg.
Lustre:
Vitreous, Sub-Vitreous
Crystal System:
Orthorhombic
Name:
Named in 1987 by Donald R. Peacor, Pete J. Dunn, S. C. Su, and J. Innes in honor of Paul Hubert Ribbe [2 April 1935 Bristol, Connecticut, USA - 24 June 2017 Virginia, USA], professor of mineralogy at Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA and investigator of crystal structures, particularly those of the feldspar group. The publication of the new species commented: "We have named this new species ribbeite in honor of Dr. Paul H. Ribbe in recognition of his many contributions to mineralogy, both to the science through his research, and to the society of mineralogists, in part through his editorship of the Reviews in Mineralogy series of the Mineralogical Society of America. It is particularly appropriate that ribbeite is closely related to the humite group, to which he has made major contributions."
Isostructural with:
Chegemite, Chondrodite, Edgrewite, Hydroxylchondrodite, Hydroxylclinohumite, Jerrygibbsite, Kumtyubeite, Leucophoenicite, Manganhumite, Norbergite, Reinhardbraunsite, Sonolite
This page provides mineralogical data about Ribbeite.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:3411:7
5816b695-0a3e-43d9-901f-388d7f324763
IMA Classification of RibbeiteHide
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Type description reference:
Peacor, Donald R., Dunn, Pete J., Su, Shu-Chun, Innes, John (1987) Ribbeite, a polymorph of alleghanyite and member of the leucophoenicite group from the Kombat mine, Namibia. American Mineralogist, 72 (1-2) 213-216
Classification of RibbeiteHide
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9.AF.65
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
52.3.2b.4
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
14.17.5
14 : Silicates not Containing Aluminum
17 : Silicates of Mn
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Rib | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of RibbeiteHide
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Fracture:
Irregular/Uneven
Density:
3.90 g/cm3 (Measured) 3.84 g/cm3 (Calculated)
Optical Data of RibbeiteHide
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RI values:
_n_α = 1.780 _n_β = 1.792 _n_γ = 1.808
2V:
Measured: 83° , Calculated: 84°
δ = 0.028
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Dispersion:
r > v distinct
Comments:
X, Y colorless; Z light pink
Comments:
Z > X - Y; X = b, Y = a, Z = c
Chemistry of RibbeiteHide
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Mindat Formula:
Mn2+5(SiO4)2(OH)2
Mn may be replaced by minor Mg.
Common Impurities:
Fe,Ca,H2O
Crystallography of RibbeiteHide
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Crystal System:
Orthorhombic
Class (H-M):
m m m _(_2/_m_2/_m_2/m ) - Dipyramidal
Cell Parameters:
a = 4.799 Å, b = 10.742 Å, c = 15.70 Å
Ratio:
a:b:c = 0.447 : 1 : 1.462
Unit Cell V:
809.35 ų (Calculated from Unit Cell)
Comment:
Space group either Pbnm or Pbn21
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0001545 | Ribbeite | Freed R L, Rouse R C, Peacor D R (1993) Ribbeite, a second example of edge-sharing silicate tetrahedra in the leucophoenicite group American Mineralogist 78 190-194 |  |
1993 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.08 Å | (5) |
| 4.41 Å | (30) |
| 4.23 Å | (2) |
| 3.93 Å | (1) |
| 3.83 Å | (30) |
| 3.53 Å | (5) |
| 3.49 Å | (5) |
| 3.362 Å | (10) |
| 3.256 Å | (5) |
| 2.925 Å | (70) |
| 2.873 Å | (80) |
| 2.821 Å | (70) |
| 2.695 Å | (60) |
| 2.552 Å | (80) |
| 2.515 Å | (40) |
| 2.398 Å | (2) |
| 2.356 Å | (40) |
| 2.315 Å | (5) |
| 2.246 Å | (10) |
| 2.216 Å | (2) |
| 2.117 Å | (5) |
| 1.996 Å | (1) |
| 1.834 Å | (1) |
| 1.796 Å | (100) |
Comments:
Peacor, Donald R., Dunn, Pete J., Su, Shu-Chun, and Innes, John (1987) Ribbeite, a Polymorph of Alleghanyite and Member of the Leucophoenicite Group from the Kombat Mine, Namibia, The American Mineralogist, v. 72, p. 213-216.
Geological EnvironmentHide
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Type Occurrence of RibbeiteHide
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General Appearance of Type Material:
Fine-grained, anhedral granular aggregates of crystals approximately 0.5 mm in diameter with a typical granulitic texture.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 163208.
Geological Setting of Type Material:
Ribbeite occurs as pinkish lenses up to 5 cm thick and 20 cm long within a 20-m-wide zone of tectonically intercalated manganese and iron ores. Locally within the stope environs, the complexly deformed manganese andiron ores assume the attitude of a vertically plunging cylindroidal fold in which ribbeite has a preferential association with carbonate-silicate facies within the manganese ores. The lenses are derived by tectonic transposition and boudinaging of the original sedimentary protore layering. The area containing ribbeite measured only ca. 40 cm across as exposed on the stope back. Ribbeite can be regarded as a scarce mineral. The transposed layering is transgressed by an abundance of veinlets of a proposed new manganese hydroxy-carbonate that clearly postdate the major tectonism but are themselves slightly deformed. Of interest also is the occurrence of manganosite as a constituent (to 5olo by volume) of some hausmannite-pyrochroite-barite-calcite layers within the Mn ores but not immediately associated with the ribbeite-alleghanyite layers. The manganosite is altering to pyrochroite and hausmannite and occurs as ragged emerald-green relicts up to 2 cm in diameter. The textural evidence strongly suggests that manganosite was a syngenetic precursor of the hausmannite ores.
Associated Minerals at Type Locality:
Reference:
Peacor, D.R., Dunn, P.J., Su, S.-C., Innes, J. (1987): Ribbeite, a polymorph of alleghanyite and member of the leucophoenicite group from the Kombat mine, Namibia. American Mineralogist, 72, 213-216.
Synonyms of RibbeiteHide
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Other Language Names for RibbeiteHide
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Relationship of Ribbeite to other SpeciesHide
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Other Members of this group:
Related Minerals - Strunz-mindat GroupingHide
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| 9.AF. | Chegemite | Ca7(SiO4)3(OH)2 | Orth. m m m _(_2/_m_2/_m_2/m ) |
|---|---|---|---|
| 9.AF. | Barwoodite | Mn2+6Nb5+(SiO4)2O3(OH)3 | Trig. 3 : _P_3 |
| 9.AF. | Jingwenite-(Y) | YAlV4+(SiO4)O2(OH)2 | Mon. 2/m |
| 9.AF.05 | Sillimanite | Al2(SiO4)O | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.AF.05 | Xenolite | Al10Si8O31 | |
| 9.AF.10 | Andalusite | Al2(SiO4)O | Orth. m m m _(_2/_m_2/_m_2/m ) : P n n m |
| 9.AF.10 | Kanonaite | Mn3+Al(SiO4)O | Orth. m m m _(_2/_m_2/_m_2/m ) : P n n m |
| 9.AF.15 | Kyanite | Al2(SiO4)O | Tric. 1 : _P_1 |
| 9.AF.20 | Mullite | Al4+2xSi2-2xO10-x | Orth. m m m _(_2/_m_2/_m_2/m ) : P b a m |
| 9.AF.20 | Krieselite | Al2(GeO4)F2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 9.AF.23 | Boromullite | Al9BSi2O19 | Orth. m _m_2 : C m _c_21 |
| 9.AF.25 | Yoderite | Mg(Al,Fe3+)3(SiO4)2O(OH) | Mon. 2/m : _P_21/m |
| 9.AF.30 | Magnesiostaurolite | Mg(Mg,Li)3(Al,Mg)18Si8O44(OH)4 | Mon. 2/m : _B_2/m |
| 9.AF.30 | Staurolite | Fe2+2Al9Si4O23(OH) | Mon. 2/m : _B_2/m |
| 9.AF.30 | Zincostaurolite | Zn2Al9Si4O23(OH) | Mon. 2/m : _B_2/m |
| 9.AF.35 | Topaz | Al2(SiO4)(F,OH)2 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.AF.40 | Norbergite | Mg3(SiO4)F2 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.AF.45 | Alleghanyite | Mn2+5(SiO4)2(OH)2 | Mon. 2/m : _P_21/b |
| 9.AF.45 | Chondrodite | Mg5(SiO4)2F2 | Mon. 2/m : _P_21/b |
| 9.AF.45 | Reinhardbraunsite | Ca5(SiO4)2(OH,F)2 | Mon. 2/m : _P_21/b |
| 9.AF.45 | Kumtyubeite | Ca5(SiO4)2F2 | Mon. 2/m : _P_21/b |
| 9.AF.45 | Hydroxylchondrodite | Mg5(SiO4)2(OH)2 | Mon. 2/m : _P_21/b |
| 9.AF.50 | Humite | Mg7(SiO4)3F2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 9.AF.50 | Manganhumite | (Mn2+,Mg)7(SiO4)3(OH)2 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.AF.50 | Unnamed (Ca-analogue of Humite) | Ca7(SiO4)4F2 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.AF.50 | Fluorchegemite | Ca7(SiO4)3F2 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.AF.50 | Unnamed (OH-analogue of humite) | Mg7(SiO4)3(OH)2 | Orth. |
| 9.AF.55 | Clinohumite | Mg9(SiO4)4F2 | Mon. 2/m : _P_21/b |
| 9.AF.55 | Sonolite | Mn2+9(SiO4)4(OH)2 | Mon. 2/m : _P_21/b |
| 9.AF.55 | Hydroxylclinohumite | Mg9(SiO4)4(OH)2 | Mon. 2/m : _P_21/b |
| 9.AF.60 | Leucophoenicite | Mn2+7(SiO4)3(OH)2 | Mon. 2/m : _P_21/b |
| 9.AF.70 | Jerrygibbsite | Mn2+9(SiO4)4(OH)2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c n |
| 9.AF.75 | Franciscanite | Mn2+6(V5+,◻)2(SiO4)2(O,OH)6 | Trig. 3 : _P_3 |
| 9.AF.75 | Örebroite | Mn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3 | Trig. 3 : _P_3 |
| 9.AF.75 | Welinite | Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6 | Trig. 3 : _P_3 |
| 9.AF.75 | Scorticoite | Mn6(Sb,◻)Σ2(SiO4)2O3(OH)3 | Trig. 3 : _P_3 |
| 9.AF.80 | Ellenbergerite | Mg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10 | Hex. 6 : _P_63 |
| 9.AF.85 | Chloritoid | Fe2+Al2O(SiO4)(OH)2 | Mon. 2/m : _B_2/b |
| 9.AF.85 | Magnesiochloritoid | MgAl2O(SiO4)(OH)2 | Mon. 2/m : _B_2/b |
| 9.AF.85 | Ottrélite | Mn2+Al2O(SiO4)(OH)2 | Mon. |
| 9.AF.90 | Poldervaartite | CaCa[SiO3(OH)](OH) | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 9.AF.90 | Olmiite | CaMn2+[SiO3(OH)](OH) | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 9.AF.95 | Pilawite-(Y) | Ca2Y2Al4(SiO4)4O2(OH)2 | Mon. 2/m : _P_21/b |
Fluorescence of RibbeiteHide
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Other InformationHide
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Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for RibbeiteHide
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References for RibbeiteHide
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Reference List:
Peacor, Donald R., Dunn, Pete J., Su, Shu-Chun, Innes, John (1987) Ribbeite, a polymorph of alleghanyite and member of the leucophoenicite group from the Kombat mine, Namibia. American Mineralogist, 72 (1-2) 213-216
Localities for RibbeiteHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 
- Good crystals or important locality for species. 
- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.