title: Boroselenate
text: # Boroselenate
  
  The boroselenates are chemical compounds containing interlinked borate and selenate groups sharing oxygen atoms. Both selenate and borate groups are tetrahedral in shape. They have similar structures to borosulfates and borophosphates. The borotellurates' tellurium atom is much bigger, so $TeO_6$ octahedra appear instead.
  
  ## List
  
  | | chem | crystal system | space group | unit cell Å | comment |
  | - | - | - | - | - | - |
  | boroseleniteselenate | $B_2Se_3O_{10}$ | monoclinic | $P2_1/c$ | a = 4.3466, b = 7.0237, c = 22.1460, β = 94.922°, Z = 4 | |
  | hydronium hexasodium boroselenate selenate | $(H_3O)Na_6[B(SeO_4)_4](SeO_4)$ | tetragonal | I4 | a=9.9796, c=18.2614 | Zunyite structure |
  | tetrapotassium hydrogen boroselenate | $K_4[BSe_4O_{15}(OH)]$ | triclinic | P1 | a=7.5303, b=7.5380, c=42.3659, α=88.740, β=89.971, γ=89.971° Z=6 | Zunyite structure |
  | | $Rb_3[B(SeO_4)_3]$ | orthorhombic | Ibca | a=7.508, b=15.249, c=23.454, Z=8 | linear |
  | | $Cs_3[B(SeO_4)_3]$ | monoclinic | $P2_1/c$ | a=11.3552, b=7.9893, c=15.7692, β=101.013° Z=4 | linear |
  