Pirop
Mineral, Inselsilikat aus der Granatgruppe
broad band at 564 nm with cutoff at 440 to 445 nm. Fine gem quality pyropes may show chromium lines in the red end of the spectrum
Πυρωπό
Euhedra typically display rhombic dodecahedral form, but trapezohedra are not uncommon, and hexoctahedra are seen in some rare samples. Massive and granular forms also occur.
Pyrop
Mineral association
Пироп
Insoluble in water, weakly soluble in HF
Prp
Піроп
Pyrope
minerale
inert
Isotropic, appears black in cross-polarized light
mineral, nesosilicate garnet
greasy to vitreous
苦礬柘榴石
Blood red to black red, red, orange red, pink, some varieties are very dark, almost black, while others can take tones of purple to purple red, Some chromium-rich pyropes are thermochromic, becoming green when heated.
minéral
vitreous
ορυκτό
Pyroop
none
Mg3Al23
Hexoctahedral
Iad
mineral nesosilicato
Piropo
минерал, силикат из группы гранатов
سيليكات المغنيسيوم والألومنيوم
MG3AL2(SIO4)3.; метаморфни минерал
minerál
H–M symbol:
White
Piropo (mineral)
Single refractive, often anomalous double refractive
ásvány
None