Danburite

UNB-2017-0241Minerals » Silicates

Description

Sample of white/yellow of prismatic subhedral Danburite with a vitreous lustre. Danburite (CaB2Si2O8) can be white to colourless but also shades of pale pink to straw yellow. Lustre is vitreous and streak is colourless. Hardness is 7 and cleavage is poor in one direction. Danburite usually occurs as prismatic crystals and resembles topaz. Striations along the length of the crystal face is common.

Specifications

Object name	Danburite
ID	UNB-2017-0241
Legal status	Permanent collection
Category	Mineral
Classification	Mineral group: Silicates
Composition	Ca2(Al,Fe)3(SiO4)3(OH) (Al,Fe2+,Fe3+Li,Mg,Mn,Ni)5−6(Al,Fe3+,Si)4(O,OH)18 K(Fe,Mg)3AlSi3O10(OH)2 BaTiSi3O9 (Mg,Fe)2Al3(Si5AlO18) (Ca,Fe,Mg)3Al2BO3Si4O12(OH) Be3Al2(Si6O18) MgSiO3 (Mg,Fe2+)5Al(Si3Al)O10(OH)8 Na2Fe2+5[Si12O30] (Na,Ca)Fe3+Si2O6 NaFe3+Si2O6 NaFe3+Si2O6 A0-1B2C5T8O22(OH,F,Cl)2 (Al,Fe)SiO4 Various (e.g., Muscovite - KAl2(AlSi3O10)(OH)2) Al2Si2O5(OH)4 Be3Al2(Si6O18) K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 NaAlSi2O6 Mg2Si2O6 Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 Na15Ca6(Fe2+,Mn2+)3Zr3Si25O733(CO3) CaMgSi2O6 CaFeSi2O6 Ca2Al3(SiO4)3(OH) CaSiO3 Ca2(Mg,Fe2+,Fe3+,Al)5(Si,Al)8O22(OH)2 (Ca,Na)19(Al,Mg,Fe)13(SiO4)10(Si2O7)4(OH,F,O)10 Na2AlSi3O8·H2O Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2 (Na,Ca)(Fe,Mg,Li,Al)3Al6(BO3)3(Si6O18)(OH)4 Ca2Al3(SiO4)3(OH) LiAlSi2O6 MnSiO3 (Mn,Fe)SiO3 ADSi2O6 Ca2Al(AlSi3O10)(OH)2·H2O (Ca,Na)(Mg,Fe)Si2O6 NaCa2Si3O8(OH)2H2O LiAlSi4O10 NaAl2(AlSi3O10)(OH)2 Mg2Mg5Si8O22(OH)2 D3[Si2O5](OH)4 Mg3(Si2O5)(OH)4 Be₃Al₂(SiO₃)₆ A(D3)G6(T6O18)(BO3)3X3Z (Mg,Al)8(Al,Si)6O20 SiO2 with variable amounts of water KAl2(AlSi3O10)(F,OH)2 Al2(SiO4)O
Age	Eon: Phanerozoic Era: Mesozoic Period: Cretaceous
Numeric age	145 Mya
Origin	Mexico
Pieces	1
Partial	No
Measurements	2.1cm x 8.5cm x 4.4cm

Map of Origin

Publications

Chesterman, C.W. 1979. Audubon Society, Field Guide to North American Rocks and Minerals. Knopf.