Jaffeite
A valid IMA mineral species
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Formula:
Ca6(Si2O7)(OH)6
Colour:
Colorless
Lustre:
Vitreous
Specific Gravity:
2.65
Crystal System:
Trigonal
Name:
Named in honor of Howard W. Jaffe (1919 - 13 May 2002, Amherst, Massachusetts, USA), professor of geology, University of Massachusetts for his contributions to mineralogy and petrology. Among other things, he was the first to recognize yttrium-aluminum substitution in garnets.
This page provides mineralogical data about Jaffeite.
Unique Identifiers
Mindat ID:
2063
Long-form identifier:
mindat:1:1:2063:9
GUID
(UUID V4):
(UUID V4):
6aa1bf25-5e22-4321-a736-f42534c495f4
IMA Classification of Jaffeite
Approved
IMA Formula:
Ca6Si2O7(OH)6
Approval year:
1987
First published:
1989
Classification of Jaffeite
9.BE.12
9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
55.3.2.1
55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
3 : Si2O7 Groups, Generally with no Additional Anions with cations in [7] coordination
55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
3 : Si2O7 Groups, Generally with no Additional Anions with cations in [7] coordination
14.5.15
14 : Silicates not Containing Aluminum
5 : Silicates of Ca
14 : Silicates not Containing Aluminum
5 : Silicates of Ca
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 |
---|---|---|
Jaf | 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 Jaffeite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness Data:
Could not be measured
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
{1010}
{1010}
Fracture:
Conchoidal
Density:
2.65(3) g/cm3 (Measured) 2.58(2) g/cm3 (Calculated)
Optical Data of Jaffeite
Type:
Uniaxial (+)
RI values:
nω = 1.596 nε = 1.604
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Chemistry of Jaffeite
Mindat Formula:
Ca6(Si2O7)(OH)6
Elements listed:
Crystallography of Jaffeite
Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
P3
Cell Parameters:
a = 10.026(5) Å, c = 7.482(4) Å
Ratio:
a:c = 1 : 0.746
Unit Cell V:
651.33 ų (Calculated from Unit Cell)
Z:
2
Morphology:
The only forms observed are {001} and {100}.
Comment:
space group by analogy to synthetic
Crystal Structure
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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) |
---|---|---|---|---|---|---|---|
0012342 | Jaffeite | Yamnova N A, Sarp K, Egorov-Tismenko Y K, Pushcharovskii D Y (1993) Crystal structure of jaffeite Crystallography Reports 38 464-467 | 1993 | metamorphic rocks, Kombat region, Namibia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
8.66 Å | (100) |
2.996 Å | (90) |
2.833 Å | (90) |
2.887 Å | (70) |
3.279 Å | (50) |
2.466 Å | (30) |
2.083 Å | (30) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
31 : Thermally altered carbonate, phosphate, and iron formations |
Type Occurrence of Jaffeite
General Appearance of Type Material:
Euhedral to subhedral crystals elongated parallel to [0001], to 0.4 mm.
Place of Conservation of Type Material:
Museum of Natural History, Geneva, Switzerland, 500/32.
National Museum of Natural History, Washington, D.C., USA, 163802.
National Museum of Natural History, Washington, D.C., USA, 163802.
Geological Setting of Type Material:
Low-grade metamorphic rocks.
Associated Minerals at Type Locality:
Reference:
Sarp, H., Peacor, D.R. (1989) Jaffeite, a new hydrated calcium silicate from the Kombat mine, Namibia. American Mineralogist, 74, 1203-1206.
Synonyms of Jaffeite
Other Language Names for Jaffeite
Related Minerals - Strunz-mindat Grouping
9.BE. | Paralomonosovite | Na6◻4Ti4(Si2O7)2[PO3OH][PO2(OH)2]O2(OF) |
9.BE. | Cámaraite | Ba3Na(Fe2+,Mn)8Ti4(Si2O7)4O4(OH,F)7 |
9.BE. | Christofschäferite-(Ce) | Ce3CaMnTiFe(3+)Ti2(Si2O7)2O8 |
9.BE. | Bobshannonite | Na2KBa(Mn,Na)8(Nb,Ti)4(Si2O7)4O4(OH)4(O,F)2 |
9.BE. | Calciomurmanite | (Na,◻)2Ca(Ti,Mg,Nb)4[Si2O7]2O2(OH,O)2(H2O)4 |
9.BE. | Batievaite-(Y) | Y2Ca2Ti(Si2O7)2(OH)2(H2O)4 |
9.BE. | Delhuyarite-(Ce) | Ce4Mg(Fe3+,W)3◻(Si2O7)2O6(OH)2 |
9.BE.X | Asimowite | Fe2+4O(Si2O7) |
9.BE. | Moxuanxueite | NaCa6Zr(Si2O7)2OF3 |
9.BE. | Alexkuznetsovite-(Ce) | Ce2Mn(CO3)(Si2O7) |
9.BE. | Biraite-(La) | La2Fe2+(CO3)(Si2O7) |
9.BE. | Zinkgruvanite | Ba4Mn2+4Fe3+2(Si2O7)2(SO4)2O2(OH)2 |
9.BE. | Madeiraite | Na2Ca2Fe2Zr2(Si2O7)2O2F2 |
9.BE. | Bortolanite | Ca2(Ca1.5Zr0.5)Na(NaCa)Ti(Si2O7)2(OF)F2 |
9.BE. | Nacareniobsite-(Y) | Na3Ca3YNb(Si2O7)2OF3 |
9.BE. | Pilanesbergite | Na2Ca2Fe2Ti2(Si2O7)2O2F2 |
9.BE. | Alfredcasparite | Sr2TiO(Si2O7) |
9.BE.02 | Wadsleyite | Mg4O(Si2O7) |
9.BE.05 | Hennomartinite | SrMn3+2(Si2O7)(OH)2 · H2O |
9.BE.05 | Lawsonite | CaAl2(Si2O7)(OH)2 · H2O |
9.BE.05 | Noelbensonite | BaMn3+2(Si2O7)(OH)2 · H2O |
9.BE.05 | Itoigawaite | SrAl2(Si2O7)(OH)2 · H2O |
9.BE.05 | Cortesognoite | CaV2(Si2O7)(OH)2 · H2O |
9.BE.07 | Ilvaite | CaFe3+Fe2+2(Si2O7)O(OH) |
9.BE.07 | Manganilvaite | CaFe2+Fe3+Mn2+(Si2O7)O(OH) |
9.BE.07 | Amamoorite | CaMn2+2Mn3+(Si2O7)O(OH) |
9.BE.10 | Suolunite | Ca2(H2Si2O7) · H2O |
9.BE.15 | Fresnoite | Ba2Ti(Si2O7)O |
9.BE.17 | Baghdadite | Ca6Zr2(Si2O7)2O4 |
9.BE.17 | Burpalite | Na2CaZr(Si2O7)F2 |
9.BE.17 | Cuspidine | Ca8(Si2O7)2F4 |
9.BE.17 | Hiortdahlite | Na2Ca4(Ca0.5Zr0.5)Zr(Si2O7)2OF3 |
9.BE.17 | Janhaugite | (Na,Ca)3(Mn2+,Fe2+)3(Ti,Zr,Nb)2(Si2O7)2O2(OH,F)2 |
9.BE.17 | Låvenite | Na2Ca2Mn2Zr2(Si2O7)2O2F2 |
9.BE.17 | Niocalite | (Ca,Nb)4(Si2O7)(O,OH,F)2 |
9.BE.17 | Normandite | NaCa(Mn,Fe)(Ti,Nb,Zr)(Si2O7)OF |
9.BE.17 | Wöhlerite | Na2Ca4ZrNb(Si2O7)2O3F |
9.BE.20 | Mosandrite-(Ce) | (Ca3REE)[(H2O)2Ca0.5◻0.5]Ti(Si2O7)2(OH)2(H2O)2 |
9.BE.20 | Nacareniobsite-(Ce) | Na3Ca3(Ce,REE)Nb(Si2O7)2OF3 |
9.BE.20 | Roumaite | (Ca,Na,REE,◻)7(Nb,Ti)[Si2O7]2OF3 |
9.BE.20 | Rinkite-(Y) | Na2Ca4YTi(Si2O7)2OF3 |
9.BE.22 | Götzenite | NaCa6Ti(Si2O7)2OF3 |
9.BE.22 | Hainite-(Y) | Na2Ca4(Y,REE)Ti(Si2O7)2OF3 |
9.BE.22 | Rosenbuschite | Na6Ca6Zr3Ti(Si2O7)4O2F6 |
9.BE.22 | Kochite | Na3Ca2MnZrTi(Si2O7)2OF3 |
9.BE.22 | Fogoite-(Y) | Na3Ca2Y2Ti(Si2O7)2OF3 |
9.BE.23 | Dovyrenite | Ca6Zr(Si2O7)2(OH)4 |
9.BE.25 | Barytolamprophyllite | (Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F) |
9.BE.25 | Ericssonite | BaMn2+2Fe3+(Si2O7)O(OH) |
9.BE.25 | Lamprophyllite | (Na,Mn2+)3(Sr,Na)2(Ti,Fe3+)3(Si2O7)2O2(OH,O,F)2 |
9.BE.25 | Ericssonite-2O | BaMn2+2Fe3+(Si2O7)O(OH) |
9.BE.25 | Seidozerite | Na4MnZr2Ti(Si2O7)2O2F2 |
9.BE.25 | Nabalamprophyllite | (BaNa)Ti2Na3Ti(Si2O7)2O2(OH)2 |
9.BE.25 | Grenmarite | Na4MnZr3(Si2O7)2O2F2 |
9.BE.25 | Schüllerite | Ba2Na(Mn,Ca)(Fe3+,Mg,Fe2+)2Ti2(Si2O7)2(O,F)4 |
9.BE.25 | Kazanskyite | BaNa3Ti2Nb(Si2O7)2O2(OH)2(H2O)4 |
9.BE.25 | Lileyite | Ba2(Na,Fe,Ca)3MgTi2(Si2O7)2O2F2 |
9.BE.25 | Emmerichite | Ba2Na(Na,Fe2+)2(Fe3+,Mg)Ti2(Si2O7)2O2F2 |
9.BE.25 | Saamite | Ba◻Na3Ti2Nb(Si2O7)2O2(OH)F(H2O)2 |
9.BE.25 | Fluorlamprophyllite | Na3(SrNa)Ti3(Si2O7)2O2F2 |
9.BE.25 | Fluorbarytolamprophyllite | (Ba,Sr)2[(Na,Fe2+)3(Ti,Mg)F2][Ti2(Si2O7)2O2] |
9.BE.27 | Murmanite | Na2Ti2(Si2O7)O2 · 2H2O |
9.BE.27 | Vigrishinite | NaZnTi4(Si2O7)2O3(OH)(H2O)4 |
9.BE.27 | Kolskyite | CaNa2Ti4(Si2O7)2O4(H2O)7 |
9.BE.27 | Selivanovaite | NaFe3+Ti4(Si2O7)2O4(H2O)4 |
9.BE.30 | Epistolite | (Na◻)Nb2Na3Ti(Si2O7)2O2(OH)2(H2O)4 |
9.BE.32 | Lomonosovite | Na5Ti2(Si2O7)(PO4)O2 |
9.BE.35 | Vuonnemite | Na11Ti4+Nb2(Si2O7)2(PO4)2O3(F,OH) |
9.BE.37 | Sobolevite | Na13Ca2Mn2Ti3(Si2O7)2(PO4)4O3F3 |
9.BE.40 | Innelite | Ba4Ti2Na(NaMn2+)Ti(Si2O7)2[(SO4)(PO4)]O2[O(OH)] |
9.BE.40 | Phosphoinnelite | Na3Ba4Ti3(Si2O7)2(PO4,SO4)2O2F |
9.BE.42 | Yoshimuraite | Ba2Mn2Ti(Si2O7)(PO4)O(OH) |
9.BE.45 | Quadruphite | Na6Na2(CaNa)2Na2Ti2Na2Ti2(Si2O7)2(PO4)4O4F2 |
9.BE.47 | Polyphite | Na5(Na4Ca2)Ti2(Si2O7)(PO4)3O2F2 |
9.BE.50 | Bornemanite | Na6BaTi2Nb(Si2O7)2(PO4)O2(OH)F |
9.BE.50 | Shkatulkalite | Na2Nb2Na3Ti(Si2O7)2O2(FO)(H2O)4(H2O)3 |
9.BE.55 | Bafertisite | Ba2Fe2+4Ti2(Si2O7)2O2(OH)2F2 |
9.BE.55 | Hejtmanite | Ba2Mn2+4Ti2(Si2O7)2O2(OH)2F2 |
9.BE.55 | Bykovaite | (Ba,Na,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(H2O,F,OH)2 · 3.5H2O |
9.BE.55 | Nechelyustovite | (Ba,Sr,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(O,H2O,F)2 · 4.5H2O |
9.BE.60 | Delindeite | (Na,K)2(Ba,Ca)2(Ti,Fe,Al)3(Si2O7)2O2(OH)2 · 2H2O |
9.BE.62 | Orthochevkinite | (Ce,La,Ca,Na,Th)4(Fe2+,Mg)2(Ti,Fe3+)3Si4O22 |
9.BE.62 va | Strontium Perrierite | (Ce,Sr,La,Ca)4Fe2+(Ti,Zr,Fe)2Ti2(Si2O7)2O8 |
9.BE.62 | Chevkinite-(Nd) | (Nd,REE)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8 ? |
9.BE.62 | Perrierite-(Nd) | Nd4MgFe3+2Ti2(Si2O7)2O8 ? |
9.BE.65 | Bussenite | Na2Ba2Fe2+Ti(Si2O7)(CO3)(OH)3F |
9.BE.67 | Jinshajiangite | BaNaFe2+4Ti2(Si2O7)2O2(OH)2F |
9.BE.67 | Perraultite | BaNaMn2+4Ti2(Si2O7)2O2(OH)2F |
9.BE.70 | Karnasurtite-(Ce) | (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si2O7)(OH)4 · 3H2O |
9.BE.70 | Perrierite-(Ce) | Ce4MgFe3+2Ti2(Si2O7)2O8 |
9.BE.70 | Strontiochevkinite | (Sr,La,Ce,Ca)4Fe2+(Ti,Zr)2Ti2(Si2O7)2O8 |
9.BE.70 | Chevkinite-(Ce) | Ce4(Ti,Fe2+,Fe3+)5O8(Si2O7)2 |
9.BE.70 | Polyakovite-(Ce) | (Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2(Si2O7)2O8 |
9.BE.70 | Rengeite | Sr4ZrTi4(Si2O7)2O8 |
9.BE.70 | Matsubaraite | Sr4Ti5(Si2O7)2O8 |
9.BE.70 | Dingdaohengite-(Ce) | (Ce,La)4Fe2+(Ti,Fe2+,Mg,Fe2+)2Ti2(Si2O7)2O8 |
9.BE.70 | Maoniupingite-(Ce) | (Ce,Ca)4(Fe3+,Ti,Fe2+,◻)(Ti,Fe3+,Fe2+,Nb)4(Si2O7)2O8 |
9.BE.70 | Perrierite-(La) | (La,Ce,Ca)4(Fe2+,Mn)(Ti,Fe3+,Al)4[(Si2O7)O4]2 |
9.BE.70 | UM2008-53-SiO:SrTiZr | Sr4ZrTi4(Si2O7)2O8 |
9.BE.70 | Hezuolinite | (Sr,REE)4Zr(Ti,Fe3+)4(Si2O7)2O8 |
9.BE.72 | Fersmanite | Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 |
9.BE.75 | Belkovite | Ba3(Nb,Ti)6(Si2O7)2O12 |
9.BE.77 | Nasonite | Pb6Ca4(Si2O7)3Cl2 |
9.BE.80 | Kentrolite | Pb2Mn3+2(Si2O7)O2 |
9.BE.80 | Melanotekite | Pb2Fe3+2(Si2O7)O2 |
9.BE.82 | Tilleyite | Ca5(Si2O7)(CO3)2 |
9.BE.82 | Alexkuznetsovite-(La) | La2Mn(CO3)(Si2O7) |
9.BE.85 | Killalaite | Ca6.4(H0.6Si2O7)2(OH)2 |
9.BE.87 | Stavelotite-(La) | (La,Nd,Ca)3Mn2+3Cu(Mn3+,Fe3+,Mn4+)26(Si2O7)6O30 |
9.BE.90 | Biraite-(Ce) | Ce2Fe2+(Si2O7)(CO3) |
9.BE.90 | Magnesiorowlandite-(Y) | Y4(Mg,Fe)(Si2O7)2F2 |
9.BE.92 | Cervandonite-(Ce) | (Ce,Nd,La)(Fe3+,Fe2+,Ti,Al)3O2(Si2O7)(As3+O3)(OH) |
9.BE.92 | Chirvinskyite | (Na,Ca)13(Fe,Mn,◻)2(Ti,Zr)5(Si2O7)4(OH,O)12 · 2H2O |
9.BE.95 | Batisivite | BaV3+8Ti6(Si2O7)O22 |
9.BE.95 | Rusinovite | Ca10(Si2O7)3Cl2 |
9.BE.97 | Schlüterite-(Y) | (Y,REE)2AlSi2O7(OH)2F |
Other Information
Notes:
Soluble in HCl.
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 Jaffeite
mindat.org URL:
https://www.mindat.org/min-2063.html
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References for Jaffeite
Reference List:
Peacor, Donald R., Sarp, Halil, Dunn, Pete J., Innes, John, Nelen, Joseph A. (1988) Defernite from the Kombat mine, Namibia: A second occurrence, structure refinement, and crystal chemistry. American Mineralogist, 73 (7-8) 888-893
Localities for Jaffeite
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).
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.
All localities listed without proper references should be considered as questionable.
Mexico | |
| Bernard et al. (2004) |
Namibia (TL) | |
| Sarp et al. (1989) +1 other reference |
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