Statements (35)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
granite
|
| gptkbp:alsoKnownAs |
gptkb:cordierite
|
| gptkbp:birefringence |
0.008–0.012
|
| gptkbp:chemicalFormula |
(Mg,Fe)2Al4Si5O18
|
| gptkbp:cleavage |
poor
|
| gptkbp:color |
blue
light blue violet yellowish gray |
| gptkbp:countryOfCitizenship |
gptkb:Brazil
gptkb:India gptkb:Myanmar gptkb:Sri_Lanka gptkb:Tanzania gptkb:United_States |
| gptkbp:crystalSystem |
orthorhombic
|
| gptkbp:discoveredBy |
gptkb:Louis_Cordier
|
| gptkbp:fracture |
conchoidal
|
| gptkbp:hardnessMohs |
7–7.5
|
| https://www.w3.org/2000/01/rdf-schema#label |
Iolite
|
| gptkbp:luster |
vitreous
|
| gptkbp:namedAfter |
gptkb:Pierre_Cordier
Greek word for violet |
| gptkbp:occurredIn |
metamorphic rocks
igneous rocks |
| gptkbp:pleochroism |
strong
|
| gptkbp:refractiveIndex |
1.53–1.55
|
| gptkbp:relatedGroup |
cyclosilicate
|
| gptkbp:specificGravity |
2.58–2.66
|
| gptkbp:transparency |
transparent
|
| gptkbp:usedAs |
granite
|
| gptkbp:usedFor |
polarizing filter (historically, Viking sunstone)
|
| gptkbp:bfsParent |
gptkb:Precious_Stone
gptkb:Gem |
| gptkbp:bfsLayer |
6
|