amorphous Tectosilicates
Lazurite (Massive (typical))
Na3Ca(Al3Si3O12)S
Quick Facts
Hardness
5.0
Specific Gravity
2.38
Refractive Index
1.5
Optical Character
Isotropic
Crystal Structure
#! Species: Lazurite
#! System: Amorphous (cryptocrystalline)
#! Habit: Massive aggregates with pyrite and calcite inclusions
amorphous[cryptocrystalline]:{massive}[inclusion:pyrite, inclusion:calcite]
amorphous
m3m
{massive}
Physical Properties
Crystal Systemamorphous
Hardness (Mohs)5.0
Specific Gravity2.38
CleavageImperfect {110}
FractureUneven
LustreVitreous to greasy
Optical Properties
Refractive Index1.5
Optical CharacterIsotropic
PleochroismNone (isotropic)
Colours
Deep blueAzure blueViolet-blueGreenish-blue
Localities
Afghanistan (Badakhshan - type locality, 6000+ years of mining)Chile (Andes)Russia (Lake Baikal)MyanmarUSA (California, Colorado)
Crystal Forms
massive
Notes
Usually occurs massive in lapis lazuli rock with pyrite and calcite
Interactive Preview
Open this crystal in the CDL Playground to rotate, export, and explore in 3D.
Open in Playground #! Species: Lazurite
#! System: Amorphous (cryptocrystalline)
#! Habit: Massive aggregates with pyrite and calcite inclusions
amorphous[cryptocrystalline]:{massive}[inclusion:pyrite, inclusion:calcite]
Related Minerals
Other minerals in the amorphous system
