(Revised April 15, 2002)
by Akira ISHIWATARI
Department of Earth Sciences, Faculty of Science, Kanazawa University, Kanazawa 920-1192 JAPAN
The chart presented below is a colored version of that included in A. Ishiwatari's paper published in the Journal of the Geological Society of Japan, Vol. 105, No. 2, p. 156-158 (1999) (hereafter referred to as "journal chart"). The chart is also published as a colored hard plastic plate associated with an interference color chart (Michel Lévy's chart) from the Geological Society of Japan (hereafter referred to as "plastic chart"). Please ask the Geological Society of Japan for purchase of the plastic plate ($2) and copyright permission. The table given below is only for personal use.
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Errata
(The errors listed here are already
corrected in the chart below) (020415 added)
1. (Journal chart) Kyanite (E3) is _
(low-angle extinction, negative sign), not - (straight extinction, negative
sign).
2. (Journal and plastic charts) "Sapphyrine" (E4) is wrong. "Sapphirine" is
correct.
3. (Journal and plastic charts) Prehnite (D3) is - (straight extinction,
negative sign), not _ (low-angle extinction, negative sign).
| A | B | C | D | E | F | G | H | |||
| Optic
Axial Angle 2Vz Optic Character |
Optically Isotropic |
0 | 20 | 60 90 | -60 | -20 | -0 | Most Important Minerals | ||
| Uniaxial | Biaxial | Optically Anisotropic | Biaxial | Uniaxial | ||||||
| Plane-Polarized Light | Positive | Positive | Conoscopic Observation | Negative | Negative | Crossed Polarized Light | ||||
| 1 Colorless | Refractive Index Low Cleavage Obscure (*Cleavage Distinct) n<=1.54-1.58 |
Fluorite* | Chabazite | Cryolite | Mordenite-* | Wairakite | Stilbite$* | Chabazite | Elongation
Sign + / - |
|
| Opal | Heulandite_* | Clinoptilolite* | Tridymite | Epistilbite^* | Scolecite_* | Sepiolite+* | Straight Extinction | +/- | ||
| Cristobalite | Chalcedony
-/+ |
Thomsonite$ | Natrolite + | Fenaksite | Laumontite^* | Cristobalite | Low-angle Extinction | ^/_ | ||
| Analcite | Leucite | GypsumX* | Mesolite$* | Canasite* | Orthoclase* (Perthite) |
Cancrinite* | High-angle Extinction | X | ||
| Sodalite | F,OH Apophyllite Na | Phillipsite^* | Microcline#* | Kaliophilite Kalsilite |
Elongation both signs | $ | ||||
| Nosean(gray) | Quartz | Catapleite* | Low Ab, An50-80 Plagioclase =* | Sanidine* | Nepheline | Twins | ||||
| Cement Resin | Xonotlite+* | Anhydrite+* | Petalite* | Cordierite - | Anortho- clase #* |
Scapolite-* | Polysynthetic | = | ||
| 2 Colorless | Refractive Index High Cleavage Obscure |
Zunyite | Eudialyte | Topaz + | Pectolite | Andalusite - | Boehmite | Beryl - | Polysynth. in 2 directions | # |
| Helvite | Phenakite | Mullite + | Chondrodite | Danburite% | Serpentine^ | Corundum- | Birefringence(Interference) | |||
| Garnet MgAl pink CaAl yel. FeAl red CaFe brown MnAl red CaCr green |
Melilite + (Åkermanite) | Sillimanite + | (Clino)Humite | Datolite | Kaolinite^ | Melilite-(Gehlenite) | Small (Low) | |||
| Pumpellyite | Chrysoberyl | Axinite | Smectite 0-30o |
Medium (Med) | ||||||
| Stishovite | Larnite | Fo Olivine Fo<90 | Pyrophyllite + | Apatite- | Large (High) | |||||
| Zircon + | Titanite(Sphene)% | Diaspore | Monticellite | Lepidolite+ | Vesuvianite | Abnormal
Inter- ference Color |
||||
| 3 Colorless | Refractive Index High Cleavage Distinct |
Alunite | Coesite 65o | Prehnite- | Tremolite^ | Margarite+ | Talc + 15o | Conoscopic Dispersion Strong % | ||
| Brucite | Barite Celestite | Lawsonite- | Cumming- tonite^= |
Paragonite+ Phengite+ | Sericite Illite | PPL Color Zoning Distinct @ | ||||
| (Clino)Zoisite$ | Antho- phyllite+ |
Gedrite Grunerite | Musco- vite + |
Phengite+ | ||||||
| Periclase | Kotoite 21o | AugiteX | En Orthopyroxene+ En<85 | Wollastonite$ | Calcite Dolomite | Opaque Minerals(Reflection) | ||||
| Diamond | PigeoniteX | DiopsideX | JadeiteX | Kyanite^ | Aragonite | Magnesite Siderite | Ilmenite (black, platy, ani) | |||
| 4 Blue-Purple | Fluorite | Scheelite | Clinoenstatite | Rhodonite(red) | Lazulite | Arfvedsonite-@ | Magnetite (bk, bulky, iso) | |||
| Hauyne | Osumilite | Chloritoid _= (Blue Green, Green) |
Sapphirine% | Glaucophane^@ Crossite$@ | Hematite (red transl. ani) | |||||
| Lazurite | Yoderite Turquoise | Azurite Riebeckite _ $ | Winchite | Tourmaline+(highly pleochroic) | Pyrite (yellow, bulky, iso) | |||||
| 5 Brown | Perovskite Melanite@ | Cassiterite@Thorite Monazite Aenigmatite | Perovskite Melanite Allanite $@ | Barkevikite | Chalcopyrite (yel. bul. ani) | |||||
| Cr-Spinel Chromite | Brookite @% | Titanite(Sphene)% | Pargasite^ | Common
Horn- blende^ |
Richterite | Biotite+ Phlogopite Stilpnomelane | Pyrrhotite (brown, platy, ani) | |||
| 6 Green-Blue Green | Al-Spinel Hercynite | Antlerite | OmphaciteX% | Barroisite^ | Graphite (black, platy, ani) | |||||
| Manganosite | Chlorite_ | Heden- bergiteX |
Aegirine Augite @ | Actinolite^ | Malachite | Chlorite^ | isotropic/ anisotropic | |||
| 7 Yellow-Yellow Green | Pyrochlore | Xenotime-Y | Pumpellyite$ | Staurolite^ | Aegirine^@ | Serpentine^ | Glauconite^ | Compiled by A. Ishiwatari Dept. of Earth Sciences Kanazawa University |
||
| Limonite Helvite | Rutile | Lampro- phyllite |
Astrophyllite Epidote $ Pistacite $@ | Anatase | ||||||
| 8 Red-Red Purple-Pink | Garnet Cuprite | Eudialyte | Titan- augiteX@ |
Piemontite$@ | Hyper- sthene+ |
Bustamite | Biotite+ Hematite |
|||
99/03/02 established, 03/08/26 revised