Tamaite
A valid IMA mineral species
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About Tamaite
Formula:
(Ca,K,Na)xMn6(Si,Al)10O24(OH)4 · nH2O (x = 1-2; n = 7-11)
Previously given as (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2O.
Colour:
Colourless to pale yellowish brown
Lustre:
Vitreous, Pearly
Hardness:
4
Specific Gravity:
2.85
Crystal System:
Monoclinic
Member of:
Name:
For the type locality, the Shiromaru Mine, Okutama, Tama District, Tokyo, Japan.
Type Locality:
Dimorph of:
Unique Identifiers
Mindat ID:
7080
Long-form identifier:
mindat:1:1:7080:1
Similar Names
| Damiaoite | A valid IMA mineral species | PtIn2 |
| Domite | A rock subtype | |
| Tamanite | A synonym of Anapaite | |
| Tamarite (of Brooke and Miller) | A synonym of Chalcophyllite | |
| Tamarite (of Ford) | A synonym of Taramite Root Name Group | |
| Tamboite | A valid IMA mineral species | Fe33+(OH)(H2O)2(SO4)(Te4+O3)3(Te4+O(OH)2)(H2O)3 |
| Tomaite | A synonym of Johntomaite | |
| Tumite | A synonym of 'Axinite' | |
| Vamaite | A synonym of 'Schraufite' |
IMA Classification of Tamaite
Approved
IMA Formula:
(Ca,K,Na)xMn2+6(Si,Al)10O24(OH)4·nH2O (x = 1-2; n = 7-11)
Approval year:
1999
First published:
2000
Classification of Tamaite
9.EG.30
9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Tam | 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 Tamaite
Vitreous, Pearly
Transparency:
Transparent
Colour:
Colourless to pale yellowish brown
Streak:
White
Hardness:
4 on Mohs scale
Comment:
Parallel to cleavage
Cleavage:
Perfect
{001} perfect
{001} perfect
Density:
2.85(5) g/cm3 (Measured) 2.83 g/cm3 (Calculated)
Optical Data of Tamaite
Type:
Biaxial (-)
Dispersion:
r < v slight
Comments:
Interference colors resemble those of muscovite.
Chemistry of Tamaite
Mindat Formula:
(Ca,K,Na)xMn6(Si,Al)10O24(OH)4 · nH2O (x = 1-2; n = 7-11)
Previously given as (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2O.
Previously given as (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2O.
Element Weights:
Crystallography of Tamaite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 16.64(1) Å, b = 27.11(2) Å, c = 25.35(2) Å
β = 98.74(7)°
β = 98.74(7)°
Ratio:
a:b:c = 0.614 : 1 : 0.935
Unit Cell V:
11,302.86 ų (Calculated from Unit Cell)
Z:
4
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0003154 | Tamaite | Hughes J M, Rakovan J F, Bracco R, Gunter M E (2003) The atomic arrangemetn of the ganophyllite-group modulated layer silicates as determined from the orthorhombic dimorph of tamaite, with the elusive 16.8 A ganophyllite-group superstructure revealed American Mineralogist 88 1324-1330 | ![]() | 2003 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.6 Å | (vvs) |
| 2.69 Å | (vs) |
| 3.13 Å | (s) |
| 2.84 Å | (s) |
| 2.60 Å | (s) |
| 2.46 Å | (s) |
| 3.46 Å | (m) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Tamaite
General Appearance of Type Material:
Micaeous aggregates. Veinlets up to 1.5 mm thick, composed of platy crystals under 0.5 mm in diameter.
Place of Conservation of Type Material:
National Science Museum, Tokyo, Japan, NSM-M 27936.
Geological Setting of Type Material:
Weakly metamorphosed manganese deposit.
Associated Minerals at Type Locality:
Synonyms of Tamaite
Other Language Names for Tamaite
Relationship of Tamaite to other Species
Member of:
Other Members of Ganophyllite Group:
| Eggletonite | (Na,K,Ca)xMn6(Si,Al)10O24(OH)4 · nH2O (x = 1-2; n = 7-11) | Mon. |
| Ganophyllite | (K,Na)xMn2+6(Si,Al)10O24(OH)4 · nH2O (x = 1-2; n = 7-11) | Mon. 2/m |
Common Associates
Associations Based on Photo Data:
| 2 photos of Tamaite associated with Inesite | Ca2(Mn,Fe)7Si10O28(OH)2 · 5H2O |
| 1 photo of Tamaite associated with Eggletonite | (Na,K,Ca)xMn6(Si,Al)10O24(OH)4 · nH2O (x = 1-2; n = 7-11) |
| 1 photo of Tamaite associated with Ganophyllite | (K,Na)xMn2+6(Si,Al)10O24(OH)4 · nH2O (x = 1-2; n = 7-11) |
Related Minerals - Strunz-mindat Grouping
| 9.EG.05 | Cymrite | BaAl2Si2(O,OH)8 · H2O |
| 9.EG.10 | Naujakasite | (Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26 |
| 9.EG.10 | Manganonaujakasite | Na6(Mn2+,Fe2+)Al4Si8O26 |
| 9.EG.15 | Dmisteinbergite | Ca(Al2Si2O8) |
| 9.EG.20 | Kampfite | Ba12(Si11Al5)O31(CO3)8Cl5 |
| 9.EG.25 | Vertumnite | Ca4Al4Si4O6(OH)24 · 3H2O |
| 9.EG.25 | Strätlingite | Ca2Al2SiO7 · 8H2O |
| 9.EG.30 | Eggletonite | (Na,K,Ca)xMn6(Si,Al)10O24(OH)4 · nH2O (x = 1-2; n = 7-11) |
| 9.EG.30 | Ganophyllite | (K,Na)xMn2+6(Si,Al)10O24(OH)4 · nH2O (x = 1-2; n = 7-11) |
| 9.EG.35 | Zussmanite | K(Fe,Mg,Mn)13(Si,Al)18O42(OH)14 |
| 9.EG.35 | Coombsite | KMn2+13(Si,Al)18O42(OH)14 |
| 9.EG.40 | 'Chalcodite' | K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27 |
| 9.EG.40 | Parsettensite | (K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2O |
| 9.EG.40 | Lennilenapeite | K4Mn2+48[Si64Al8]O164(OH)52 · nH2O |
| 9.EG.40 | Stilpnomelane | K4Fe2+48[Si64Al8]O164(OH)52 · nH2O |
| 9.EG.45 | Latiumite | (Ca,K)4(Si,Al)5O11(SO4,CO3) |
| 9.EG.45 | Levantite | KCa3Al2(SiO4)(Si2O7)(PO4) |
| 9.EG.45 | Tuscanite | KCa6(Si,Al)10O22(SO4,CO3)2(OH) · H2O |
| 9.EG.50 | Jagoite | Pb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6 |
| 9.EG.50 | Friisite | Pb8Al3Si8O27Cl3 |
| 9.EG.55 | Wickenburgite | CaPb3Al2Si10O24(OH)6 |
| 9.EG.60 | Hyttsjöite | Pb18Ba2Ca5Mn2+2Fe3+2Si30O90Cl · 6H2O |
| 9.EG.65 | Armbrusterite | K5Na7Mn15[(Si9O22)4](OH)10 · 4H2O |
| 9.EG.70 | Roymillerite | Pb24Mg9(Si10O28)(CO3)10(BO3)(SiO4)(OH)13O5 |
| 9.EG.70 | Britvinite | [Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)] |
| 9.EG.75 | Kayupovaite | Na2Mn10[(Si14Al2)O38(OH)8] · 7H2O |
| 9.EG.75 | 'UM1989-30-SiO:AlBaCaFeHKMgMn' | (Ba,Ca)(Mn,Fe,Mg)22(Si,Al)32O76(OH)16 · 12H2O |
| 9.EG.75 | Bannisterite | (Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O |
Fluorescence of Tamaite
Not fluorescent
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 Tamaite
mindat.org URL:
https://www.mindat.org/min-7080.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Tamaite
Reference List:
Matsubara, Satoshi, Miyawaki, Ritsuro, Tiba, Tokiko, Imai, Hiroyuki (2000) Tamaite, the Ca-analogue of ganophyllite, from the Shiromaru mine, Okutama, Tokyo, Japan. Journal of Mineralogical and Petrological Sciences, 95 (5) 79-83 doi:10.2465/jmps.95.79
Localities for Tamaite
Showing 5 localities.
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.
Italy | |
| Hughes et al. (2003) |
| Piccoli et al. (2021) |
Japan (TL) | |
| [J.Mineral.Petrol.Sci. (2000) +4 other references |
Switzerland | |
| Ansermet S.; Meisser N. (2026) |
USA | |
| Richard Gunter Collection. |
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Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK