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30 Cards in this Set

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GROUP
TWO OR MORE CHEMICALLY RELATED GEM MINERAL SPECIES THAT ARE SIMILAR IN STRUCTURE AND PROPERTIES
IRRIDESCENCE
ORIENT
ADULARESCENCE
CHANGE-OF-COLOR

-Prismatic--Fire agate
-Prismatic sheen-Pearl, shell, Mother of pearl
-Floating interior light-moonstone
-selective absorption of light-Chrysoberyl,Alex
HABIT
THE CRYSTAL FORM WHICH A MINERAL MOST OFTEN OCCURS

EG. HABIT OF DIAMOND IS OCTOHEDRON
ORGANIC GEMS
PEARL
CORAL
JETT
AMBER
MOTHER-OF-PEARL
CAMEO
ITALIO
ABOVE THE GIRDLE
BELOW THE GIRDLE
PHENOMENONS-
CHATOYANCY
ASTERISM
PLAY-OF-COLOR
LABRADORESCENCE
9 TYPES-
-quartz tigers eye, chrysoberyl cat's eye
-star ruby star sapphire
-glittery efect-quartz, adventurine, sunstone
-OPAL
-Broad flash of color-Labradorite (feldspar)
AGATES
CHALCEDONY+
ACHROMATIC
COLORS PERCEIVED TO HAVE NO HUE(COLOR)

EG. GRAYS, BLACK, WHITE
SYNTHETIC
HAS ESSENTIALLY THE SAME OPTICAL, CHEMICAL, AND PHYSICAL PROPERTIES OF IT'S NATURAL COUNTERPART
CRYSTAL SYSTEMS
ISOMETRIC (CUBIC)
HEXAGONAL
TETRAGONAL
ORTHRHOMBIC
MONOCLINIC
TRICLINIC
IDIOCHROMATIC
GEM COLORED BY AN ESSENTIAL COMPNENT

EG. IRON IN PERIDOT
FLOURESCENCE
EMISSION OF VISIBLE LIGHT BY UV OR X-RAY
ISOMORPH
SUBSTITUTION OF METAL IONS IN A CRYSTAL STRUCTURE
AMORPHOUS
WITHOUT FORM...NO CRYSTAL STRUCTURE
ANISOTROPIC
POSEESING THE PROPERTY OF DOUBLE REFRACTION
SPECIES
MINERALS W/ DEFINITE CHEMICAL COMPOSITION AND USUALLY CHARACTERISTIC CRYSTAL STRUCTURE
EG. CORUNDUM, BERYL
BIREFRINGENCE
STRENGTH OF DOUBLE REFRACTION BY TAKING THE DIFFERENCE OF THE HI & LO INDICES OF A DOUBLY REFRACTIVE STONE
VARIETY
SUBDIVISIONS OF SPECIES
EG.
SPECIES-CORUNDUM
VARIETY-RUBY, SAPPHIRE
ADAMAS
INDESTRUCTIBLE
UNCONQUERABLE
INVINCIBLE
POLYMORPH
SAME CHEMICAL BUT A DIFFERENT CRYSTAL

EG. DIAMOND OR GRAPHITE
both carbon
MOH'S SCALE OF HARDNESS
TALC ORTHOCLASE
GYPSUM QUARTZ
CALCITE TOPAZ
FLOURITE CORUNDUM
APATITE DIAMOND
DICHROSCOPE


DICHROISM
INSTRUMENT USED TO DETECT PLEOCHROISM

PRODUCING TWO COLORS WHEN OBSERVED THROUGH A DICHROSCOPE
PSEUDOMORPH
FALSE FORM
IRIDESCENCE
LIGHT INTERFERENCE EFFECT IN THIN FILMS OF GAS OR LIQUID CAUSING RAINBOW EFFECTS
GARNETS
PYROPE-RHODALITE
ALMANDITE
SPESSARTITE-MALAIA(COLOR CHG)
GROSSULARITE-HESSONITE, TSAVORTITE
ADRADITE-DEMANTOID,MELANITE
UVAROITE
ALL COLORS..EX. BLUE
ISOMETRIC
CHRYSOBERYL
ALEXANDRITE-COLOR CHANGE
ALLOCHROMATIC
GEM THAT DERIVE THEIR COLOR FROM AN ESSENTIAL IMPURITY...
EG. RUBY OR EMERALD
MINERAL CRYSTAL SYSTEMS
ISOMETRIC
HESAGONAL
TETRAGONAL
ORTHORHOMBIC
MONOCLINIC
TRICLINIC
PLEOCHROISM
UNEQUAL ABSORPTION OF THE TWO PORTIONS OF A DOUBLY REFRACTED BEAM OF LIGHT, PRODUCING TWO OR MORE COLORS THROUGH A DICHROSCOPE
PERIDOT (OLIVINE)
EVENING EMERALD
YELLOW-GREEN-->GREENISH-YELLOW