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KYI071 Kyanite Emerald 6.5 x 4.5 mm .75 ct $2.50 |
KYI072 Kyanite Emerald 6 x 4 mm .65 ct $2.50 |
KYI073 Kyanite Oval 8 x 6 mm 1.70 ct $5.25 |
KYI074 Kyanite Oval 8 x 6 mm 1.80 ct $4.25 |
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KYI061 Kyanite Oval 8 x 6 mm 1.20 ct SOLD |
KYI062 Kyanite Emerald 7 x 5 mm 1.15 ct $2.75 |
KYI063 Kyanite Oval 8 x 6 mm 1.40 ct SOLD |
KYI064 Kyanite Emerald 6 x 4 mm .65 ct SOLD |
KYI065 Kyanite Oval 9 x 6 mm 1.75 ct $4.50 |
KYI066 Kyanite Emerald 7.5 x 4.5 mm 1.05 ct $2.75 |
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KYI055 Kyanite Oval 10 x 6 mm 2.45 ct $8.50 |
KYI056 Kyanite Rectangle-Emerald 8 x 5 mm 1.35 ct $5.75 |
KY9 Kyanite Oval 7 x 5 mm .90 ct $3.00 |
KYI058 Kyanite Emerald 6 x 5 mm .95 ct $3.25 |
KYI059 Kyanite Oval 8 x 6 mm 1.15 ct $6.25 |
KYI060 Kyanite Emerald 7 x 5 mm 1.20 ct SOLD |
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KYI048 Kyanite Oval 9 x 5 mm 2.05 ct SOLD |
KYI042 Kyanite Oval 8 x 6 mm 1.60 ct $4.50 |
KY7 Kyanite Oval 9 x 6 mm 1.40 ct $6.00 |
KYI051 Kyanite Convex Rectangle 10 x 6 mm 1.85 ct $7.00 |
KYI052 Kyanite Oval 8 x 6 mm 1.45 ct $6.00 |
KY13 Kyanite Oval 7 x 6 mm 1.40 ct $4.00 |
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KYI043 Kyanite Convex Rectangle 10 x 6 mm 2.05 ct SOLD |
KYI044 Kyanite Oval 9 x 6 mm 1.60 ct $6.75 |
KYI045 Kyanite Convex Rectangle 9.5 x 5.5 mm 1.85 ct $6.50 |
KYI022 Kyanite Oval 8 x 6 mm 1.70 ct $7.00 |
KYI046 Kyanite Emerald 7 x 5 mm 1.00 ct $3.25 |
KYI047 Kyanite Rectangle Cushion 10 x 7 mm 2.75 ct SOLD |
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KYI053 Kyanite Oval 9 x 6 mm 1.55 ct $6.50 |
KY4 Kyanite Emerald 8 x 5 mm 1.50 ct $4.00 |
KYI067 Kyanite Emerald 7 x 5 mm 1.10 ct $3.00 |
KYI068 Kyanite Emerald 7 x 5 mm 1.45 ct SOLD |
KYI069 Kyanite Emerald 7 x 5 mm 1.15 ct $1.00 |
KYI070 Kyanite Emerald 7 x 5 mm 1.10 ct $3.00 |
Kyanite is a polymorph with two other minerals: andalusite and sillimanite. A polymorph is a mineral that shares the same chemistry but a different crystal structure with another, or other, minerals.
Since the three minerals form under different conditions of temperature and pressure, they are diagnostic for those conditions.
Kyanite is an attractive mineral that has a near sapphire-like blue color in some especially nice specimens.
Kyanite has a nearly unique characteristic in that it has a wide variation in hardness in the same crystal face. The hardness of kyanite is approximately 4.5 when scratched parallel to the long axis of the crystal and approximately 6.5 when scratched perpendicular to or across the long axis. Other minerals usually have variable hardness on different crystal faces due to a different concentration and orientation of the atoms in the structure. Diamond is another such mineral, a fact gem cutters use to their advantage.
Since the three minerals form under different conditions of temperature and pressure, they are diagnostic for those conditions.
Kyanite is an attractive mineral that has a near sapphire-like blue color in some especially nice specimens.
Kyanite has a nearly unique characteristic in that it has a wide variation in hardness in the same crystal face. The hardness of kyanite is approximately 4.5 when scratched parallel to the long axis of the crystal and approximately 6.5 when scratched perpendicular to or across the long axis. Other minerals usually have variable hardness on different crystal faces due to a different concentration and orientation of the atoms in the structure. Diamond is another such mineral, a fact gem cutters use to their advantage.
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HOME
AGATE - BLACK
AGATE - TREE
ALEXANDRITE
AMBER
AMETHYST - AFRICAN
AMETHYST - BRAZILIAN
AMETHYST - CABOCHON
AMETHYST - GREEN
AMETHYST - PINK
AQUAMARINE
AVENTURINE - BLUE
AVENTURINE - GREEN
BLOODSTONE
CALCITE - RED
CALCITE - RED CRYSTAL
CARNELIAN
CHALCEDONY
CHAROITE
CHROME DIOPSIDE
CITRINE
CITRINE 2
CITRINE - MANDARIN
CUSTOM WORK
DIAMOND
DIAMOND - ROUGH
EMERALD
EMERALD 2
FLUORITE
GARNET
GOLD & TREASURE
GOLDSTONE
IOLITE
JADE
JADE - JADEITE
JADE - NEPHRITE
JASPER - BROWN
JASPER - LEOPARDSKIN
JASPER - PICTURE
JASPER - RED
JASPER - RED BRECCIATED
JEWELRY - CRYSTAL
JEWELRY - GEMSTONE
KYANITE
MIXED GEMS
MOONSTONE
OBSIDIAN
OBSIDIAN - BLACK
OBSIDIAN - MAHOGANY
OBSIDIAN - SNOWFLAKE
OBSIDIAN - WHITEOLITE
ONYX
OPAL - BOULDER
OPAL - DOUBLET
OPAL - DOUBLET 2
OPAL - FIRE
OPAL - HEART
OPAL - MARQUISE
OPAL - OVAL
OPAL - PENDANTS & MORE
OPAL - ROUGH
OPAL - ROUGH 2
OPAL - RUB
OPAL - RUB 2
PEARL
PERIDOT
PRE-DRILLED
PREHNITE
QUARTZ - BEER
QUARTZ - LEMON
QUARTZ - ROSE
QUARTZ - SMOKY
QUARTZ - WHITE
RUBY
RUBY 2
RUBY - STAR
SAPPHIRE - BLUE
SAPPHIRE - BLUE 2
SAPPHIRE - MIXED
SAPPHIRE - MIXED 2
SAPPHIRE - STAR
SODALITE
SPECIMENS - "ROCK"
SPESSARTITE
SPINEL
TANZANITE
TIGERS EYE
TOPAZ
TOPAZ 2
TOURMALINE
TOURMALINE 2
TSAVORITE
ZIRCON
AGATE - BLACK
AGATE - TREE
ALEXANDRITE
AMBER
AMETHYST - AFRICAN
AMETHYST - BRAZILIAN
AMETHYST - CABOCHON
AMETHYST - GREEN
AMETHYST - PINK
AQUAMARINE
AVENTURINE - BLUE
AVENTURINE - GREEN
BLOODSTONE
CALCITE - RED
CALCITE - RED CRYSTAL
CARNELIAN
CHALCEDONY
CHAROITE
CHROME DIOPSIDE
CITRINE
CITRINE 2
CITRINE - MANDARIN
CUSTOM WORK
DIAMOND
DIAMOND - ROUGH
EMERALD
EMERALD 2
FLUORITE
GARNET
GOLD & TREASURE
GOLDSTONE
IOLITE
JADE
JADE - JADEITE
JADE - NEPHRITE
JASPER - BROWN
JASPER - LEOPARDSKIN
JASPER - PICTURE
JASPER - RED
JASPER - RED BRECCIATED
JEWELRY - CRYSTAL
JEWELRY - GEMSTONE
KYANITE
MIXED GEMS
MOONSTONE
OBSIDIAN
OBSIDIAN - BLACK
OBSIDIAN - MAHOGANY
OBSIDIAN - SNOWFLAKE
OBSIDIAN - WHITEOLITE
ONYX
OPAL - BOULDER
OPAL - DOUBLET
OPAL - DOUBLET 2
OPAL - FIRE
OPAL - HEART
OPAL - MARQUISE
OPAL - OVAL
OPAL - PENDANTS & MORE
OPAL - ROUGH
OPAL - ROUGH 2
OPAL - RUB
OPAL - RUB 2
PEARL
PERIDOT
PRE-DRILLED
PREHNITE
QUARTZ - BEER
QUARTZ - LEMON
QUARTZ - ROSE
QUARTZ - SMOKY
QUARTZ - WHITE
RUBY
RUBY 2
RUBY - STAR
SAPPHIRE - BLUE
SAPPHIRE - BLUE 2
SAPPHIRE - MIXED
SAPPHIRE - MIXED 2
SAPPHIRE - STAR
SODALITE
SPECIMENS - "ROCK"
SPESSARTITE
SPINEL
TANZANITE
TIGERS EYE
TOPAZ
TOPAZ 2
TOURMALINE
TOURMALINE 2
TSAVORITE
ZIRCON