Epidote-(Sr)
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About Epidote-(Sr)
Formula:
{CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Crystal System:
Monoclinic
Member of:
Name:
Named in 2008 by T. Minakawa, H. Fukushima, D. Nishio-Hamane and H. Miura for the chemical relationship to epidote.
Type Locality:
Isostructural with:
Clinozoisite Subgroup of the Epidote Group.
The Fe(III) analogue of clinozoisite-(Sr) and piemontite-(Sr).
The Fe(III) analogue of clinozoisite-(Sr) and piemontite-(Sr).
Classification of Epidote-(Sr)
Approved
Approval year:
2006
8/C.23-
9.BG.05a
9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
58.2.2.3
58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Physical Properties of Epidote-(Sr)
Transparency:
Translucent
Cleavage:
Perfect
parallel to {001}
parallel to {001}
Optical Data of Epidote-(Sr)
Type:
Biaxial (-)
RI values:
nα = 1.737(2) nβ = 1.780(2) nγ = 1.792(2)
2V:
Calculated: 62°
Max Birefringence:
δ = 0.055

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:
Very High
Colour in reflected light:
pale reddish brown to brown
Pleochroism:
Visible
Comments:
X: pale greenish yellow, and Y = Z: pale reddish brown to brownish pink
Chemical Properties of Epidote-(Sr)
Formula:
{CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
IMA Formula:
CaSr(Al2Fe3+)[Si2O7][SiO4]O(OH)
Chemical Analysis
Oxide wt%:
1 | |
---|---|
SiO2 | 32.4 % |
Al2O3 | 19.0 % |
Fe2O3 | 13.4 % |
Mn2O3 | 0.7 % |
MnO | 1.3 % |
CaO | 12.4 % |
SrO | 7.2 % |
PbO | 10.9 % |
H2O | 1.6 % |
Total: | 98.9 % |
Sample references:
ID | Locality | Reference |
---|---|---|
1 | Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA | Frank K. Mazdab collection (thin section FKM-88; https://www.rockptx.com/fkm-76-to-fkm-100/#FKM-88) |
Crystallography of Epidote-(Sr)
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 8.928(5) Å, b = 5.652(1) Å, c = 10.244(5) Å
β = 114.46(4)°
β = 114.46(4)°
Ratio:
a:b:c = 1.58 : 1 : 1.812
Unit Cell V:
470.5 ų
Z:
2
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) |
---|---|---|---|---|---|---|---|
0013136 | Epidote-(Sr) | Minakawa T, Fukushima H, Nishio-Hamane D, Miura H (2008) Epidote-(Sr), CaSrAl2Fe(Si2O7)(SiO4)(OH), a new mineral from the Ananai mine, Kochi Prefecture, Japan Journal of Mineralogical and Petrological Sciences 103 400-406 | 2008 | Ananai mine, Kochi Prefecture, Japan | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.92 Å | (100) |
2.58 Å | (49) |
3.50 Å | (42) |
2.61 Å | (42) |
2.72 Å | (41) |
2.83 Å | (32) |
3.26 Å | (23) |
Type Occurrence of Epidote-(Sr)
General Appearance of Type Material:
prismatic crystals up to 1 cm in length
Place of Conservation of Type Material:
Museum at the Hokkaido University, Sapporo, Japan (specimen no. Mineral-07400)
Associated Minerals at Type Locality:
Synonyms of Epidote-(Sr)
Other Language Names for Epidote-(Sr)
Japanese:ストロンチウム緑簾石
Relationship of Epidote-(Sr) to other Species
Member of:
Other Members of this group:
Clinozoisite | {Ca2}{Al3}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
Epidote | {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
Hancockite | {CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH) | Mon. |
Mukhinite | {Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH) | Mon. |
Niigataite | {CaSr}{Al3}(Si2O7)(SiO4)O(OH) | Mon. 2/m |
Piemontite | {Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
Piemontite-(Pb) | {CaPb}{Al2Mn3+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
Piemontite-(Sr) | {CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH) | Mon. |
Tweddillite | {CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
Unnamed (Fe3+ analogue of Piemontite-(Pb)) | {CaPb}{Fe3+AlMn3+}(Si2O7)(SiO4)O(OH) | |
Unnamed (Fe3+-analogue of Piemontite) | {CaCa}{Fe3+AlMn3+}(Si2O7)(SiO4)(OH,O)2 | |
Unnamed (Fe3+-analogue of Piemontite-(Sr)) | {CaSr}{Fe3+AlMn3+}(Si2O7)(SiO4)O(OH) | |
Unnamed (Ga-dominant member of the epidote group) | {Ca2}{Al2(Ga,Fe)}(Si2O7)(SiO4)O(OH) |
Related Minerals - Nickel-Strunz Grouping
9.BG. | Shuiskite-(Cr) | Ca2Cr3+Cr3+2[Si2O6OH][SiO4](OH)2O | Mon. 2/m : B2/m |
9.BG. | Alnaperbøeite-(Ce) | Ca(Ce2.5Na0.5)(AlAl2Al)[Si2O7][SiO4]3O(OH)2 | Mon. 2/m : P21/m |
9.BG. | Magnesiovesuvianite | Ca19MgAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 | Tet. 4/m : P4/n |
9.BG. | Alumovesuvianite | Ca19AlAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 | Tet. 4/m : P4/n |
9.BG.05b | Allanite-(Ce) | {CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Allanite-(La) | {CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Allanite-(Y) | {CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH) | Mon. |
9.BG.05a | Clinozoisite | {Ca2}{Al3}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Dissakisite-(Ce) | {CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05 | Dollaseite-(Ce) | {CaCe}{MgAlMg}(Si2O7)(SiO4)F(OH) | Mon. 2/m : P21/m |
9.BG.05a | Epidote | {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05a | Hancockite | {CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH) | Mon. |
9.BG.05 | Khristovite-(Ce) | {CaCe}{MgAlMn2+}(Si2O7)(SiO4)F(OH) | Mon. 2/m : P21/m |
9.BG.05a | Mukhinite | {Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH) | Mon. |
9.BG.05a | Piemontite | {Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05 | Piemontite-(Sr) | {CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH) | Mon. |
9.BG.05b | Manganiandrosite-(La) | {Mn2+La}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH) | Mon. |
9.BG.05 | Tawmawite | {Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH) | |
9.BG.05 | Tweddillite | {CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Ferriallanite-(Ce) | {CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05 | Niigataite | {CaSr}{Al3}(Si2O7)(SiO4)O(OH) | Mon. 2/m |
9.BG.05 | Manganiandrosite-(Ce) | {Mn2+Ce}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05 | Dissakisite-(La) | {CaLa}{Al2Mg}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05 | Vanadoandrosite-(Ce) | {Mn2+Ce}{V3+AlMn2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05 | Uedaite-(Ce) | {Mn2+Ce}{Al2Fe2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Allanite-(Nd) | {CaNd}{Al2Fe2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Ferriallanite-(La) | {CaLa}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Åskagenite-(Nd) | {Mn2+Nd}{Al2Fe3+}(Si2O7)(SiO4)O2 | Mon. 2/m : P21/m |
9.BG.9.BG. | Ferriakasakaite-(La) | {CaLa}{Fe3+AlMn2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.9.BG. | Ferriandrosite-(Ce) | {Mn2+Ce}{Fe3+AlMn2+}(SiO4)(Si2O7)O(OH) | |
9.BG.9.BG | Ferriperbøeite-(Ce) | CaCe3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2 | Mon. 2/m : P21/m |
9.BG.10 | Zoisite | Ca2Al3[Si2O7][SiO4]O(OH) | Orth. mmm (2/m 2/m 2/m) : Pnma |
9.BG.15 | Macfallite | Ca2Mn3+3(SiO4)(Si2O7)(OH)3 | Mon. |
9.BG.15 | Sursassite | Mn2+2Al3(SiO4)(Si2O7)(OH)3 | Mon. 2/m : P21/m |
9.BG.20 | Julgoldite-(Fe2+) | Ca2Fe2+Fe3+2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.20 | Okhotskite | Ca2Mn2+Mn3+2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.20 | Pumpellyite-(Fe2+) | Ca2Fe2+Al2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.20 | Pumpellyite-(Fe3+) | Ca2Fe3+Al2[Si2O6OH][SiO4](OH)2O | Mon. |
9.BG.20 | Pumpellyite-(Mg) | Ca2MgAl2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.20 | Pumpellyite-(Mn2+) | Ca2Mn2+Al2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.20 | Shuiskite-(Mg) | Ca2MgCr3+2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.20 | Julgoldite-(Fe3+) | Ca2Fe3+Fe3+2[Si2O6OH][SiO4](OH)2O | Mon. |
9.BG.20 | Pumpellyite-(Al) | Ca2AlAl2[Si2O6OH][SiO4](OH)2O | Mon. |
9.BG.20 | Poppiite | Ca2V3+V3+2[Si2O6OH][SiO4](OH)2O | Mon. 2/m : B2/m |
9.BG.20 | Julgoldite-(Mg) | Ca2MgFe3+2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.25 | Ganomalite | Pb9Ca5Mn(Si2O7)4(SiO4)O | Hex. |
9.BG.30 | Rustumite | Ca10(Si2O7)2(SiO4)(OH)2Cl2 | Mon. |
9.BG.35 | Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 | Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc |
9.BG.35 | Wiluite | Ca19MgAl4(Al,Mg)8(B,◻)4◻[Si2O7]4[(SiO4)10]O(O,OH)9 | Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc |
9.BG.35 | Manganvesuvianite | Ca19Mn3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 | Tet. 4/m : P4/n |
9.BG.35 | Fluorvesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(F,OH)9 | Tet. 4/mmm (4/m 2/m 2/m) |
9.BG.35 | Cyprine | Ca19Cu2+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 | Tet. 4/m : P4/n |
9.BG.40 | Vyuntspakhkite-(Y) | (Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7 | Mon. |
9.BG.45 | Dellaite | Ca6Si3O11(OH)2 | Tric. |
9.BG.50 | Gatelite-(Ce) | CaCe3(AlAl2Mg)[Si2O7][SiO4]3O(OH)2 | Mon. 2/m : P21/b |
9.BG.55 | Västmanlandite-(Ce) | CaCe3(MgAl2Mg)[Si2O7][SiO4]3F(OH)2 | Mon. 2/m : P21/m |
Related Minerals - Dana Grouping (8th Ed.)
58.2.2.1 | Julgoldite-(Fe2+) | Ca2Fe2+Fe3+2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
58.2.2.2 | Julgoldite-(Fe3+) | Ca2Fe3+Fe3+2[Si2O6OH][SiO4](OH)2O | Mon. |
58.2.2.3 | Okhotskite-(Mg) | Ca8(Mn2+,Mg)(Mn3+,Al,Fe3+)(SiO4)(Si2O7)(OH)2 · H2O | Mon. |
58.2.2.5 | Pumpellyite-(Fe2+) | Ca2Fe2+Al2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
58.2.2.6 | Pumpellyite-(Fe3+) | Ca2Fe3+Al2[Si2O6OH][SiO4](OH)2O | Mon. |
58.2.2.7 | Pumpellyite-(Mg) | Ca2MgAl2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
58.2.2.8 | Pumpellyite-(Mn2+) | Ca2Mn2+Al2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
58.2.2.9 | Shuiskite-(Mg) | Ca2MgCr3+2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
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.
References for Epidote-(Sr)
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Minakawa, T., H. Fukushima, D. Nishio-Hamane & H. Miura (2008): Epidote-(Sr), CaSrAl2Fe3+(Si2O7)(SiO4)(OH), a new mineral from the Ananai mine, Kochi Prefecture, Japan. Journal of Mineralogical and Petrological Sciences 103, 400-406.
Internet Links for Epidote-(Sr)
mindat.org URL:
https://www.mindat.org/min-31558.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
Localities for Epidote-(Sr)
Locality List




All localities listed without proper references should be considered as questionable.
France | |
| MONCHOUX P., FONTAN F., DE PARSEVAL P., MARTIN R. F., WANG R. C. (2006) - Igneous albitite dikes in orogenic lherzolithes, Western Pyrénées, France: A possible source for corundum and alkali feldspar xenocrysts in basaltic terranes. I. Mineralogical Asssociations. The Canadian Mineralogist, Vol. 44, pp. 817-842. |
MONCHOUX P., FONTAN F., DE PARSEVAL P., MARTIN R. F., WANG R. C. (2006) - Igneous albitite dikes in orogenic lherzolithes, Western Pyrénées, France: A possible source for corundum and alkali feldspar xenocrysts in basaltic terranes. I. Mineralogical Asssociations. The Canadian Mineralogist, Vol. 44, pp. 817-842. | |
| MONCHOUX P., FONTAN F., DE PARSEVAL P., MARTIN R. F., WANG R. C. (2006) - Igneous albitite dikes in orogenic lherzolithes, Western Pyrénées, France: A possible source for corundum and alkali feldspar xenocrysts in basaltic terranes. I. Mineralogical Asssociations. The Canadian Mineralogist, Vol. 44, pp. 817-842. |
Japan (TL) | |
| Journal of Mineralogical and Petrological Sciences 103,400-406(2008) |
| Miyajima H (2014) Jadeitite from Itoigawa, Niigata Prefecture, central Japan. 21 st meeting of the International Mineralogical Association. p 200 |
| Tanaka, T. & Hamane, D. (2016) Epidote-(Sr) from Shiromaru mine, Tokyo prefecture, Japan. (conference presentation R1-P14) |
UK | |
| Cotterell, T., Tayler, R.(2012): Epidote-(Sr) and piemontite-(Sr): two minerals new to Britain from Benallt mine, Pen Llŷn, Gwynedd, Wales. UK Journal of Mines and Minerals 33:39-42. |
USA | |
| Frank K. Mazdab collection (thin section FKM-88; https://www.rockptx.com/fkm-76-to-fkm-100/#FKM-88) |
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Benallt Mine, Rhiw, Aberdaron, Gwynedd, Wales, UK