Kellyite
A valid IMA mineral species
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About Kellyite
William C. Kelly
Formula:
Mn2+2Al(AlSiO5)(OH)4
Colour:
Yellow
Hardness:
2½
Specific Gravity:
3.07
Crystal System:
Hexagonal
Member of:
Name:
Named in honor of William Crowley Kelly (b. 1929), Professor in the Department of Geology and Mineralogy, University of Michigan, Ann Arbor, Michigan, USA, and administrator, for his contributions to the study of worldwide ore deposits.
This page provides mineralogical data about Kellyite.
Unique Identifiers
Mindat ID:
2180
Long-form identifier:
mindat:1:1:2180:3
Similar Names
| Clayite (of Mellor) | A synonym of Kaolinite | |
| Clayite (of Taylor) | ||
| Keeleyite | A synonym of Zinkenite | |
| Pellyite | A valid IMA mineral species | Ba2CaFe22+Si6O17 |
IMA Classification of Kellyite
Classification of Kellyite
9.ED.15
9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
71.1.2c.5
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers
16.16.6
16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Kly | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Kly | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30 |
Physical Properties of Kellyite
Transparency:
Transparent
Colour:
Yellow
Hardness:
2½ on Mohs scale
Cleavage:
Perfect
Perfect on {0001}.
Perfect on {0001}.
Density:
3.07 g/cm3 (Measured) 3.11 g/cm3 (Calculated)
Optical Data of Kellyite
Type:
Uniaxial (-)
RI values:
nω = 1.646 nε = 1.639
Max. Birefringence:
δ = 0.007
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Optical Extinction:
X ⊥ (001).
Comments:
X = colorless to greenish yellow; Y = Z = pale yellow
to reddish brown.
to reddish brown.
Chemistry of Kellyite
Mindat Formula:
Mn2+2Al(AlSiO5)(OH)4
Element Weights:
Common Impurities:
Ti,Fe,H2O
Crystallography of Kellyite
Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P63
Cell Parameters:
a = 5.438(8) Å, c = 14.04(1) Å
Ratio:
a:c = 1 : 2.582
Unit Cell V:
359.56 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Irregular to platy tablets and laths, to 3 mm.
Comment:
Z is inferred (Handbook of Mineralogy).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.51 Å | (100) |
| 7.0 Å | (90) |
| 2.53 Å | (60) |
| 2.67 Å | (40) |
| 2.34 Å | (40) |
| 1.954 Å | (30) |
| 1.570 Å | (30) |
Comments:
Bald Knob, North Carolina, USA. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Kellyite
General Appearance of Type Material:
Transparent, yellow, 1 mm sized grains dispersed within manganese carbonates. Irregular-to-platy yellow tablets and laths.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, numbers 127101 and 137140/1 (cotype/type).
University of Michigan, Ann Arbor, USA, (cotype).
University of Michigan, Ann Arbor, USA, (cotype).
Geological Setting of Type Material:
Banded Ca-Mn carbonates.
Associated Minerals at Type Locality:
Synonyms of Kellyite
Other Language Names for Kellyite
Relationship of Kellyite to other Species
Member of:
Other Members of Serpentine Subgroup:
| Amesite | Mg2Al(AlSiO5)(OH)4 | Tric. 1 : P1 |
| Antigorite | Mg3(Si2O5)(OH)4 | Mon. m : Bm |
| Berthierine | (Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4 | Mon. m : Bm |
| Brindleyite | (Ni,Al)3(Si,Al)2O5(OH)4 | Mon. |
| Caryopilite | Mn2+3Si2O5(OH)4 | Mon. |
| Chrysotile | Mg3(Si2O5)(OH)4 | Mon. m : Bb |
| Cronstedtite | Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4 | Trig. 3m : P31m |
| Fraipontite | (Zn,Al)3((Si,Al)2O5)(OH)4 | Mon. |
| Guidottiite | Mn2Fe3+(Fe3+SiO5)(OH)4 | Hex. 6 : P63 |
| Lizardite | Mg3(Si2O5)(OH)4 | Trig. 3m : P31m |
| Népouite | Ni3Si2O5(OH)4 | Orth. |
| Pecoraite | Ni3(Si2O5)(OH)4 | Mon. |
Common Associates
Associations Based on Photo Data:
| 9 photos of Kellyite associated with Alleghanyite | Mn2+5(SiO4)2(OH)2 |
| 7 photos of Kellyite associated with Kutnohorite | CaMn2+(CO3)2 |
| 5 photos of Kellyite associated with Jacobsite | Mn2+Fe3+2O4 |
| 3 photos of Kellyite associated with Calcite | CaCO3 |
| 1 photo of Kellyite associated with Galaxite | Mn2+Al2O4 |
| 1 photo of Kellyite associated with Sarkinite | Mn2+2(AsO4)(OH) |
Related Minerals - Strunz-mindat Grouping
| 9.ED. | 'Clinochrysotile' | Mg3(Si2O5)(OH)4 |
| 9.ED.05 | Dickite | Al2(Si2O5)(OH)4 |
| 9.ED.05 | Nacrite | Al2(Si2O5)(OH)4 |
| 9.ED.05 | Kaolinite | Al2(Si2O5)(OH)4 |
| 9.ED.05 | Odinite | (Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4 |
| 9.ED.10 | Halloysite | Al2Si2O5(OH)4 · n(H2O) |
| 9.ED.10 | Hisingerite | Fe3+2(Si2O5)(OH)4 · 2H2O |
| 9.ED.10 | 'Hydrohalloysite' | Al2Si2O5(OH)4 · 2H2O |
| 9.ED.15 | Antigorite | Mg3(Si2O5)(OH)4 |
| 9.ED.15 | Brindleyite | (Ni,Al)3(Si,Al)2O5(OH)4 |
| 9.ED.15 | Fraipontite | (Zn,Al)3((Si,Al)2O5)(OH)4 |
| 9.ED.15 | Népouite | Ni3Si2O5(OH)4 |
| 9.ED.15 | Pecoraite | Ni3(Si2O5)(OH)4 |
| 9.ED.15 | Guidottiite | Mn2Fe3+(Fe3+SiO5)(OH)4 |
| 9.ED.15 | Lizardite | Mg3(Si2O5)(OH)4 |
| 9.ED.15 | Berthierine | (Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4 |
| 9.ED.15 | Cronstedtite | Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4 |
| 9.ED.15 | Caryopilite | Mn2+3Si2O5(OH)4 |
| 9.ED.15 | Amesite | Mg2Al(AlSiO5)(OH)4 |
| 9.ED.15 | Greenalite | (Fe2+,Fe3+)2-3Si2O5(OH)4 |
| 9.ED.15 | Manandonite | Li2Al4(Si2AlB)O10(OH)8 |
| 9.ED.20 | Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| 9.ED.20 | Neotocite | (Mn,Fe)SiO3 · H2O (?) |
| 9.ED.20 | Allophane | (Al2O3)(SiO2)1.3-2 · 2.5-3H2O |
| 9.ED.20 | Imogolite | Al2SiO3(OH)4 |
| 9.ED.25 | Bismutoferrite | Fe3+2Bi(SiO4)2(OH) |
| 9.ED.25 | Chapmanite | Fe3+2Sb3+(Si2O5)O3(OH) |
| 9.ED.30 | 'Pianlinite' | Al2Si2O6(OH)2 |
Other Information
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 Kellyite
mindat.org URL:
https://www.mindat.org/min-2180.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Kellyite
Localities for Kellyite
Showing 18 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Austria | |
| Kolitsch et al. (2021) |
| Kolitsch et al. (2019) |
Canada | |
| Avalon Advanced Materials Inc. |
| HORVÁTH et al. (2000) |
China | |
| Yuchun Yang (1990) |
France | |
| Chopin (1978) |
| Chopin (1978) |
Japan | |
| Matsubara & Kato (1986) |
| Yamada (2004) |
| K. Nishikubo et al. (2005) +1 other reference |
Romania | |
| Hîrtopanu et al. (2003) +1 other reference | |
| Paulina HIRTOPANU & Gheorghe UDUBASA (2015) +1 other reference |
| Hîrtopanu (1997) +1 other reference |
Russia | |
| webmineral.ru (2020) |
| Brusnitsyn (2000) |
| Brusnitsyn A.I. (2000) |
UK | |
| Cotterell (2013) |
USA (TL) | |
| Rocks & Min.: 60:130-135. +1 other reference |
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Bald Knob, Sparta, Alleghany County, North Carolina, USA