Silicate carbonate

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The silicate carbonates are double salts that contain both silicate and carbonate in their formula. Most compounds are natural minerals containing calcium or rare earth elements. However, some have been made experimentally. Silicate carbonate minerals can be formed in limestone metamorphosed by heating from igneous intrusions.[1] Scawtite forms where the activity of calcium is high compared to H+. Spurrite forms in a limited range of calcium activity and high silica activity.[2] In magma, a carbonate rich melt is imiscible with a silicate melt.[3]

Structures

Silicate carbonates contain carbonate triangles, and silicate tetrahedrons, SiO4. Tillyite contains disilicate Si2O7 units.[1]

Properties

List

Thaumasite prisms
formula name structure density comment ref
Ca4Si2O6(OH)2(CO3) fukalite [4]
Ca5(SiO4)2(CO3) spurrite [5]
Ca5(Si2O7)(CO3)2 tilleyite monoclinic  =7.582 Å, b=10.265 Å, c =15.030 Å β=103.99° [1]
Ca5(Si2O7)(CO3)2 post-Tilleyite [1]
Ca6(CO3)1.58(Si2O7)0.21(OH)7Cl0.5(OH)0.08 (H2O)0.42 deferenite [6]
Ca7(SiO4)3(CO3) galuskinite [1]
Ca7(Si6O18)(CO3)·2H2O scawtite [1]
Ca3Si(OH)6(CO3)(SO4)•12H2O thaumasite Hexagonal a = 11.03, c = 10.4 [7]
Na7Ca[Al6Si6O24](CO3)1.5•2H2O cancrinite hexagonal a = 12.67 c = 5.15 [8]
(Ca4Al6Si6O24CO3) meionite tetragonal I4/m a = 12.179, c = 7.571, Z = 2 [9]
(Ca,Na)4Al6Si6O24(SO4,CO3) silvialite
scapolite [10]
K2Ca[Si2O5](CO3) P6322 a = 5.0479 c = 17.8668 artificial [6]
KNa4Ca4[Si8O18](CO3)4F·H2O carletonite [6]
Y2(SiO4)(CO3) iimoriite-(Y) triclinic P1_ a=6.549 b=6.629 c=6.4395 α=116.36° β=92.56° γ=195.507° [11]
Ca2Y2[SiO3]4(CO3)·H2O kainosite [6]
Ca4Y4[Si2O5]4(CO3)6·7H2O caysichite [6]
K5Na5Y12[Si2O5]14(CO3)8(OH)2·8H2O ashcroftine [6]
Na2Ba2FeTi[Si2O7](CO3) (OH)3F bussenite [6]
Ba6Fe3[Si8O23](CO3)2Cl3·H2O fencooperite [6]
La2Mn(CO3)(Si2O7) alexkuznetsovite-(La) P21/c Z = 4 a = 6.5642 b = 6.7689 c = 18.721 Å, β = 108.684° V = 788.00 Å3 [12]
La2Fe2+(CO3)(Si2O7) biraite-(La) P21/c Z = 4 a = 6.566 b = 6.767 c = 18.698 Å, β = 108.95° V = 785.7 Å3 [12]
Ce2Mn(CO3)(Si2O7) alexkuznetsovite-(Ce) P21/c Z = 4 a = 6.5764 b = 6.7685 c = 18.749 Å, β = 108.672° V =790.7 Å3 [12]
Ce2Fe2+[Si2O7](CO3) biraite monoclinic P21/c, a 6.505 b 6.744 c 18.561 β=108.75° [6][13]
Na2Ce2TiO2[SiO4](CO3)2 tundrite [6]
(Y1.44Er0.56)[SiO4](CO3) iimorite [6]
Pb19.4Na1.9[Si10O25](CO3)9(OH)12.7 artificial [14]
Cu4Pb4[SiO3](HCO3)4)OH)4Cl ashburtonite [6]

References

  1. ^
    PMID 31133679
    .
  2. doi:10.2138/rmg.2013.77.3
    .
  3. PMC 9130134
    .
  4. doi:10.1016/j.gca.2013.03.031
    .
  5. PMID 29227639
    .
  6. ^
    doi:10.1016/j.solidstatesciences.2016.08.003
    .
  7. ^ "Thaumasite Mineral Data". www.webmineral.com.
  8. ^ "Cancrinite". Archived from the original on 2024-02-06. Retrieved 2024-02-06.
  9. ^ "Meionite".
  10. ^ "Scapolite: A metamorphic mineral and interesting gem". geology.com. Retrieved 2024-01-23.
  11. ^ "The atomic arrangement of iimoriite-(Y), Y 2 (SiO 4)(CO 3)" (PDF). The Canadian Mineralogist. 34 (4): 817–820.
  12. ^
    S2CID 239701801
    .
  13. ISSN 0935-1221
    .
  14. S2CID 255201629
    .
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