Statements (38)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
granite
|
| gptkbp:associatedMinerals |
gptkb:chlorite
quartz magnetite grunerite |
| gptkbp:category |
gptkb:amphibole
|
| gptkbp:chemicalFormula |
(Mg,Fe)7Si8O22(OH)2
|
| gptkbp:cleavage |
perfect
|
| gptkbp:color |
brown
gray greenish |
| gptkbp:containsElement |
hydrogen
iron oxygen magnesium silicon |
| gptkbp:crystalSystem |
monoclinic
|
| gptkbp:density |
3.1 g/cm³
|
| gptkbp:discoveredIn |
gptkb:Cummington,_Massachusetts
|
| gptkbp:event |
metamorphic rocks
schists gneisses iron formations |
| gptkbp:habit |
fibrous aggregates
prismatic crystals |
| gptkbp:hardnessMohs |
5.5
|
| https://www.w3.org/2000/01/rdf-schema#label |
cummingtonite
|
| gptkbp:IMAStatus |
approved mineral
|
| gptkbp:luster |
vitreous
|
| gptkbp:namedAfter |
gptkb:Cummington,_Massachusetts
|
| gptkbp:opticalProperties |
biaxial (-)
|
| gptkbp:refractiveIndex |
1.62–1.68
|
| gptkbp:relatedGroup |
inosilicate
|
| gptkbp:streak |
white
|
| gptkbp:symmetry |
C2/m
|
| gptkbp:tenacity |
brittle
|
| gptkbp:bfsParent |
gptkb:amphibole
|
| gptkbp:bfsLayer |
6
|