7 results found for: “grandidierite”.

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Grandidierite

Grandidierite is a rare mineral that was first discovered in 1902 in southern Madagascar. The mineral was named in honor of French explorer Alfred Grandidier...

Last Update: 2021-01-08T13:42:49Z Word Count : 189 Synonim Grandidierite

List of gemstones by species

Umbalite Gaspeite Gaylussite Gibbsite Glaucophane Goethite Goosecreekite Grandidierite Gypsum Gyrolite Halite Hambergite Hanksite Hardystonite Hauyne Hematite...

Last Update: 2021-01-28T09:43:07Z Word Count : 708 Synonim List of gemstones by species

Serendibite

diopside, spinel, phlogopite, scapolite, calcite, tremolite, apatite, grandidierite, sinhalite, hyalophane, uvite, pargasite, clinozoisite, forsterite,...

Last Update: 2020-12-30T00:11:09Z Word Count : 83 Synonim Serendibite

List of minerals

Gold Goldmanite Gonnardite Gordaite Gormanite Goslarite Graftonite Grandidierite Grandreefite Graphite Gratonite Greenalite Greenockite Gregoryite Greifensteinite...

Last Update: 2021-04-15T23:32:03Z Word Count : 2588 Synonim List of minerals

Gemstone

the Musgrave Mountains in South Australia and named for the location. Grandidierite was discovered by Antoine François Alfred Lacroix (1863–1948) in 1902...

Last Update: 2021-04-15T18:14:22Z Word Count : 3646 Synonim Gemstone

Alfred Grandidier

in his honor by French herpetologist François Mocquard. The mineral grandidierite, discovered in Madagascar, was also named in his honor, as is the giant...

Last Update: 2021-01-22T10:40:23Z Word Count : 650 Synonim Alfred Grandidier

List of minerals approved by IMA (G)

. [429] [no] [430] (IUPAC: distrontium aluminium hydro diarsenate) Grandidierite (Y: 1902) 9.AJ.05 [431] [432] [433] (MgAl3O2(BO3)(SiO4)) Grandreefite...

Last Update: 2021-04-03T17:13:16Z Word Count : 3558 Synonim List of minerals approved by IMA (G)

Main result

Grandidierite

Grandidierite is a rare mineral 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. Grandidierites appear bluer in color the more iron (Fe) they contain. A recently discovered gemstone, blue ominelite, is the Fe-analogue (Fe, Mg) to grandidierite (Mg, Fe).Grandidierites display strong trichroic pleochroism. That means that it can show three different colors depending on the viewing angle: dark blue-green, colorless (sometimes a very light yellow), or dark green. While trichroism can usually help distinguish grandidierites from other gems, lazulites can occur with blue-green colors and show colorless/blue/dark blue pleochroism. Nevertheless, lazulites have somewhat higher refractive indices and specific gravity. Grandidierites also have greater hardness. Large faceted grandidierite specimens are extremely rare. The largest cut specimen currently known to the GIA weighs in at 763.5 carats.


grandidierite
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