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Clinozoisite

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Formula:
{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Colour:
colourless, green, grey, light green, yellow-green, pink
Lustre:
Vitreous
Hardness:
7
Specific Gravity:
3.3 - 3.4
Crystal System:
Monoclinic
Name:
Named in 1896 by Ernst Weinschenk in allusion to its its monoCLINic crystal form and the relationship to Zoisite.
Clinozoisite Subgroup of the Epidote Group

Clinozoisite-Epidote Series. The Al3 analogue of Epidote.

May be visually similar to zoisite.

Visit gemdat.org for gemological information about Clinozoisite.


Classification of Clinozoisite

Approved, 'Grandfathered' (first described prior to 1959)
9.BG.05a

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
Dana 7th ed.:
58.2.1.4
58.2.1a.4

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)
16.9.9

16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca

Physical Properties of Clinozoisite

Vitreous
Transparency:
Transparent, Translucent
Colour:
colourless, green, grey, light green, yellow-green, pink
Streak:
Greyish White
Hardness:
Cleavage:
Perfect
on {001}
Fracture:
Irregular/Uneven
Density:
3.3 - 3.4 g/cm3 (Measured)    3.23 g/cm3 (Calculated)

Optical Data of Clinozoisite

Type:
Biaxial (+)
RI values:
nα = 1.706 - 1.724 nβ = 1.708 - 1.729 nγ = 1.712 - 1.735
2V:
Measured: 14° to 90°, Calculated: 72° to 86°
Max Birefringence:
δ = 0.006 - 0.011
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v or r < v

Chemical Properties of Clinozoisite

Formula:
{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
IMA Formula:
Ca2Al3(Si2O7)(SiO4)O(OH)
Common Impurities:
Ti,Fe,Mn,Mg

Crystallography of Clinozoisite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 8.879(5) Å, b = 5.583(5) Å, c = 10.155(6) Å
β = 115.50(5)°
Ratio:
a:b:c = 1.59 : 1 : 1.819
Unit Cell V:
454.36 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder Diffraction

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
2.89 (100)
2.79 (90)
2.68 (60)
2.67 (60)
2.59 (70)
2.40 (60)
2.29 (60)

Type Occurrence of Clinozoisite

Synonyms of Clinozoisite

Other Language Names for Clinozoisite

Varieties of Clinozoisite

Chrome-Clinozoisite

A Cr3+-bearing clinozoisite low in Fe3+.

Clinothulite

A pink, Mn3+-bearing variety of clinozoisite. Much so-called thulite is actually clinothulite. Compare thulite.

Relationship of Clinozoisite to other Species

Other Members of this group:
Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Epidote-(Sr){CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)
Niigataite{CaSr}{Al3}(Si2O7)(SiO4)O(OH)
Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Piemontite-(Pb){CaPb}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
Tweddillite{CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)
Forms a series with:

Common Associates

Associated Minerals Based on Photo Data:
Quartz65 photos of Clinozoisite associated with Quartz on mindat.org.
Anorthite20 photos of Clinozoisite associated with Anorthite on mindat.org.
Grossular20 photos of Clinozoisite associated with Grossular on mindat.org.
Prehnite19 photos of Clinozoisite associated with Prehnite on mindat.org.
Epidote19 photos of Clinozoisite associated with Epidote on mindat.org.
Calcite17 photos of Clinozoisite associated with Calcite on mindat.org.
Hessonite13 photos of Clinozoisite associated with Hessonite on mindat.org.
Orthoclase13 photos of Clinozoisite associated with Orthoclase on mindat.org.
Chrysocolla13 photos of Clinozoisite associated with Chrysocolla on mindat.org.
Diopside12 photos of Clinozoisite associated with Diopside on mindat.org.

Related Minerals - Nickel-Strunz Grouping

9.BG.XCyprineCa19Cu2+(Al10Mg2)Si18O68(OH)10
9.BG.05bAllanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bDissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)
9.BG.05Dollaseite-(Ce){CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)F
9.BG.05aEpidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05Khristovite-(Ce){CaCe}{MgAlMn2+}(Si2O7)(SiO4)(OH)F
9.BG.05Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)
9.BG.05Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
9.BG.05Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
9.BG.05bManganiandrosite-(La){Mn2+La}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Tawmawite{Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH)
9.BG.05Tweddillite{CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)
9.BG.05bFerriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
9.BG.05Niigataite{CaSr}{Al3}(Si2O7)(SiO4)O(OH)
9.BG.05Manganiandrosite-(Ce){Mn2+Ce}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Dissakisite-(La){CaLa}{Al2Mg}(Si2O7)(SiO4)O(OH)
9.BG.05Vanadoandrosite-(Ce){Mn2+Ce}{V3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Uedaite-(Ce){Mn2+Ce}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05Epidote-(Sr){CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(Nd){CaNd}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bFerriallanite-(La){CaLa}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bÅskagenite-(Nd){Mn2+Nd}{Al2Fe3+}(Si2O7)(SiO4)O2
9.BG.10Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
9.BG.15MacfalliteCa2Mn3+3(SiO4)(Si2O7)(OH)3
9.BG.15SursassiteMn2+2Al3(SiO4)(Si2O7)(OH)3
9.BG.20Julgoldite-(Fe2+)Ca2Fe2+Fe3+2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20OkhotskiteCa2(Mn,Mg)(Mn3+,Al,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Fe3+)Ca2(Fe3+,Mg)(Al,Fe3+)2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20ShuiskiteCa2MgCr2(Si2O7)(SiO4)(OH)2 · 2H2O
9.BG.20Julgoldite-(Fe3+)Ca2Fe3+Fe3+2(Si2O7)(SiO4)O(OH) · H2O
9.BG.20Pumpellyite-(Al)Ca2Al3(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20PoppiiteCa2(V3+,Fe3+,Mg)(V3+,Al)2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20Julgoldite-(Mg)Ca2MgFe3+2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.25GanomalitePb9Ca5Mn(Si2O7)4(SiO4)O
9.BG.30RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2
9.BG.35Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
9.BG.35WiluiteCa19(Al,Mg)13(B,☐,Al)5(Si2O7)4(SiO4)10(O,OH)10
9.BG.35ManganvesuvianiteCa19Mn3+(Al,Mn3+,Fe3+)10(Mg,Mn2+)2(Si2O7)4(SiO4)10O(OH)9
9.BG.35FluorvesuvianiteCa19(Al,Mg,Fe2+)13(Si2O7)4(SiO4)10O(F,OH)9
9.BG.40Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7
9.BG.45DellaiteCa6Si3O11(OH)2
9.BG.50Gatelite-(Ce)CaCe3Al2(Al,Mg)(Mg,Fe2+,Al)(Si2O7)(SiO4)3(O,F)(OH,O)2
9.BG.55Västmanlandite-(Ce)Ce3CaMg2Al2Si2O15(OH)2F

Related Minerals - Hey's Chemical Index of Minerals Grouping

16.9.1GehleniteCa2Al(AlSiO7)
16.9.2AnorthiteCa(Al2Si2O8)
16.9.3Yoshiokaite(Ca,Na)[Al(Al,Si)O4]
16.9.4SvyatoslaviteCa(Al2Si2O8)
16.9.5DmisteinbergiteCa(Al2Si2O8)
16.9.6GrossularCa3Al2(SiO4)3
16.9.7VuagnatiteCaAl(SiO4)(OH)
16.9.8Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
16.9.10PrehniteCa2Al2Si3O10(OH)2
16.9.11KamaishiliteCa2(Al2SiO6)(OH)2
16.9.12BicchuliteCa2(Al2SiO6)(OH)2
16.9.13MargariteCaAl2(Al2Si2O10)(OH)2
16.9.14ChantaliteCaAl2(SiO4)(OH)4
16.9.15CebolliteCa5Al2(SiO4)3(OH)4
16.9.17KatoiteCa3Al2(SiO4)3-x(OH)4x
16.9.18LawsoniteCaAl2(Si2O7)(OH)2 · H2O
16.9.19ParthéiteCa2(Si4Al4) O15 (OH)2•4H2O
16.9.20WairakiteCa(Al2Si4O12) · 2H2O
16.9.21VertumniteCa4Al4Si4O6(OH)24 · 3H2O
16.9.22ScoleciteCaAl2Si3O10 · 3H2O
16.9.23LaumontiteCaAl2Si4O12 · 4H2O
16.9.24YugawaraliteCaAl2Si6O16 · 4H2O
16.9.25Gismondine-CaCaAl2Si2O8 · 4H2O
16.9.26EpistilbiteCaAl2Si6O16 · 5H2O
16.9.27GoosecreekiteCa[Al2Si6O16] · 5H2O
16.9.28CowlesiteCaAl2Si3O10 · 6H2O
16.9.30StelleriteCa4(Si28Al8)O72 · 28H2O
16.9.31SträtlingiteCa2Al2SiO7 · 8H2O
16.9.32AmstalliteCaAl(Si,Al)4O8(OH)4 · (H2O,Cl)

Related Minerals - Dana Grouping (8th Ed.)

58.2.1a.1Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
58.2.1a.2Allanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
58.2.1a.3Allanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
58.2.1a.5Dissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)
58.2.1a.6Dollaseite-(Ce){CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)F
58.2.1a.7Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
58.2.1a.8Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
58.2.1a.9Khristovite-(Ce){CaCe}{MgAlMn2+}(Si2O7)(SiO4)(OH)F
58.2.1a.10Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)
58.2.1a.11Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
58.2.1a.12Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)

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 Clinozoisite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
De Angelis G., Sgarlata F. (1974) Contributo alla conoscenza della clinozoisite. Periodico di mineralogia: 103-111.
Dollase, W.A. (1968) Refinement and comparison of the structures of zoisite and clinozoisite. American Mineralogist: 53: 1882-1898.
Holland, T.J.B., Redfern, S.A.T., Pawley, A.R. (1996) Volume behavior of hydrous minerals at high pressure and temperature: II. Compressibilities of lawsonite, zoisite, clinozoisite and epidote. American Mineralogist: 81: 341-348.
Pawley, A.R., Redfern, S.A.T., Holland, T.J.B. (1996) Volume behavior of hydrous minerals at high pressures and temperatures: I. Thermal expansion of lawsonite, zoisite, clinozoisite, and diaspore. American Mineralogist: 81: 335-340.

Internet Links for Clinozoisite

mindat.org URL:
https://www.mindat.org/min-1087.html
Please feel free to link to this page.
Specimens:
The following Clinozoisite specimens are currently listed for sale on minfind.com.

Localities for Clinozoisite

Mineral and/or Locality  
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