Chlorastrolite
E763160
Chlorastrolite is a green, star-patterned variety of pumpellyite best known as a semi-precious gemstone found in the Lake Superior region.
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
mineraloid variety
ⓘ
semi-precious gemstone ⓘ variety of pumpellyite ⓘ |
| associatedWith |
amygdaloidal basalt
ⓘ
metamorphosed basalt ⓘ |
| chemicalFormula | Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2·H2O ⓘ |
| color |
bluish-green
ⓘ
green ⓘ |
| containsElement |
aluminum
ⓘ
calcium ⓘ hydrogen ⓘ iron ⓘ magnesium ⓘ oxygen ⓘ silicon ⓘ |
| formationEnvironment |
hydrothermal alteration of basalt
ⓘ
low-grade metamorphic ⓘ |
| foundIn |
beach pebbles of Lake Superior
ⓘ
vesicles in basalt ⓘ |
| fracture | uneven ⓘ |
| hardnessMohs | 5.5–6 ⓘ |
| hasPattern |
star pattern
ⓘ
stellate pattern ⓘ turtleback pattern ⓘ |
| luster |
silky
ⓘ
vitreous ⓘ |
| mineralGroup | pumpellyite group ⓘ |
| nickname |
greenstone
ⓘ
turtleback stone ⓘ |
| occursIn |
Copper Country, Michigan, USA
NERFINISHED
ⓘ
Isle Royale, Michigan, USA NERFINISHED ⓘ Keweenaw Peninsula, Michigan, USA NERFINISHED ⓘ Lake Superior region NERFINISHED ⓘ |
| opticalProperty |
chatoyancy-like effect
ⓘ
radial fibrous structure ⓘ |
| rarity | relatively rare ⓘ |
| specificGravity | 3.2–3.4 ⓘ |
| stateGem | Michigan NERFINISHED ⓘ |
| stateGemDesignationYear | 1972 ⓘ |
| system | monoclinic ⓘ |
| tenacity | tough ⓘ |
| transparency |
opaque
ⓘ
translucent ⓘ |
| typicalCut | cabochon ⓘ |
| usedAs | gemstone ⓘ |
| usedFor |
cabochons
ⓘ
jewelry ⓘ |
| valueFactor |
intensity of green color
ⓘ
sharpness of star pattern ⓘ |
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.