| 词条 | Grandidierite |
| 释义 |
| name = Grandidierite | image = Grandidierite-169886.jpg | alt = 260px | caption = | category = Nesosilicate | formula = (Mg,Fe2+)Al3(BO3)(SiO4)O2 | strunz = 9.AJ.05 | dana = 54.01.01.01 | system = OrthorhombicB | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Pbnm | unit cell = | color = Bluish green | habit = | twinning = none | cleavage = Perfect | fracture = Brittle | tenacity = | mohs = 7.5 | luster = Vitreous, Pearly | streak = White | diaphaneity = Transparent, Translucent | gravity = | density = 2.976 | polish = | opticalprop = Biaxial (-) | refractive = 1.583 - 1.639 | birefringence = | pleochroism = Visible | 2V = Measured: 24° to 32°, Calculated: 32° | dispersion = strong r < v | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = [1][2] }} Grandidierite is an extremely rare mineral and gem that was first discovered in 1902 in southern Madagascar. The mineral was named in honor of French explorer Alfred Grandidier (1836–1912) who studied the natural history of Madagascar.[1]. References1. ^1 Grandidierite: Grandidierite mineral information on Mindat {{silicate-mineral-stub}}2. ^Grandidierite mineral data on Webmineral 3 : Orthorhombic minerals|Nesosilicates|Gemstones |
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