Constituent
- Name
- zoisite
- IMA name
- Zoisite
- Class
- silicate mineral
- Compound type
- sorosilicate
- Comments
- alteration phase of plagioclase
- Relevance
- impurity
- Arrangement
- homogeneous in multi-phases
- Mass fraction
- 0.02 $\pm$ 0.005
- Formula
- $Ca_2Al_3(SiO_4)(Si_2O_7)O(OH)$
- Chemical formula
- Ca2Al3(SiO4)(Si2O7)O(OH)
- Elemental formula
- Ca2 Al3 Si3 O13 H
- Isotope mixture type
- terrestrial abundance
Strunz
- Class
- silicates (09)
- Division
- sorosilicate (09.B)
- Family
- Sorosilicates with mixed SiO4 and Si2O7 groups (09.BG)
- Code
- 09.BG.10
Dana
- Major class
- silicates (VIII)
- Class
- sorosilicate insular, mixed, single, and larger tetrahedral groups (58)
- Type
- with cations in [6] and higher coordination; single and double groups (n=1,2) (58.02)
- Group
- Epidote group (Zoisite subgroup) (58.02.01b)
- Code
- 58.02.01b.01
- Phase type
- crystalline
- Crystal system
- orthorhombic
- Crystal class
- dipyramidal
- Crystal class symbol
- mmm (D2h)
- Crystal spacegroup
- Pnma
- Molar mass
- 454.36 $g/mol$
- Density
- 3.3 $g/cm^3$
- Refringence type
- biaxial
- Refringence sign
- positive
- Birefringence
- 0.0060-0.0180
- Refraction index $n_{\alpha}$
- 1.696-1.7
- Refraction index $n_{\beta}$
- 1.696-1.702
- Refraction index $n_{\gamma}$
- 1.702-1.718
- Dispersion V
- 2V(Calc)=0-40, 2V(Meas)=0-70. Dispersion relatively strong
- Color
- Colorless, purple, greyish-white, grey, yellowish-brown, yellow, pink, green
- Diaphaneity
- transparent to subtranslucent
- Luster
- vitreous