GEMOLOGY I
Terms
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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