Input interpretation
andesine (mineral) | howlite (mineral)
Images
Images
General properties
| andesine | howlite alternate names | ab60 | an40 | plagioclase (An30-50) | howelite | silicoborocalcite | winkworthite | white turquoise | white buffalo stone formula | (Na, Ca)(Si, Al)_4O_8 | Ca_2B_5SiO_9(OH)_5 discovery year | | 1868
Basic properties
| andesine | howlite density | 2.67 g/cm^3 | 2.58 g/cm^3 transparency | transparent | subtransparent | translucent | translucent birefringence | 0.0085 | 0.02 luster | subvitreous | subvitreous Mohs hardness | 6.25 | 3 streak | white | white magnetism | nonmagnetic | nonmagnetic color | colorless | gray | yellow green | white | colorless | white fracture | uneven | brittle | conchoidal molar mass | 268.6 g/mol | 391.3 g/mol
Units
Mineral identifiers
| andesine | howlite Strunz ID | VIII/J.07-40 | VIII/F.28-10 Dana ID | 76.1.3.3 | 25.3.5.1 ICSD number | | ICSD15178
Crystallographic properties
| andesine | howlite crystal system | triclinic | monoclinic crystal class | 1 | 2/m unit cell volume | 861.5 Å^3 (cubic ångströms) | 991.3 Å^3 (cubic ångströms) d-spacing | 3.21 Å (ångströms) | 3.18 Å (ångströms) | 4.04 Å (ångströms) | 6.207 Å (ångströms) | 3.894 Å (ångströms) | 3.094 Å (ångströms) intensity | 100% | 90% | 80% | 100% | 95% | 65% molecules per unit cell | 6 molecules per cell | 4 molecules per cell 2V angle | 4 π/9 radians≈80° (degrees) | 5 π/12 radians≈75° (degrees) refractive indices | 1.549 | 1.553 | 1.557 | 0 | 0 | 0 | 1.58 | 0 | 0 | 0 | 0 | 0 dispersion | none | none unit cell lengths | 8.155 Å (ångströms) | 12.9 Å (ångströms) | 9.16 Å (ångströms) | 12.78 Å (ångströms) | 9.33 Å (ångströms) | 8.6 Å (ångströms) unit cell angles | 93.92° (degrees) | 116.3° (degrees) | 89.17° (degrees) | 90° (degrees) | 104.8° (degrees) | 90° (degrees)
Wikipedia summary
Andesine
Andesine is a silicate mineral, a member of the plagioclase feldspar solid solution series. Its chemical formula is (Ca, Na)(Al, Si)_4O_8, where Ca/(Ca + Na) (% anorthite) is between 30-50%. The formula may be written as Na_(0.7-0.5)Ca_(0.3-0.5)Al_(1.3-1.5)Si_(2.7-2.5)O_8.
Howlite
Howlite, a calcium borosilicate hydroxide (Ca_2B_5SiO_9(OH)_5), is a borate mineral found in evaporite deposits.