Sillimanite
It is named after its discoverer Benjamin Silliman.
It is related to andalusite and kyanite. These three polymorphous minerals - share the same chemical composition but different crystal structures.
Al2(SiO4)O
-
GEMS
-
FACETED GEMS
- AQUAMARINE
- AMETHYST
- AMETRINE
- ANDALUCITE
- ANDESINE
- APATITE
- AXINITE
- BITOWNITA
- KYANITE
- CLINOHUMITE
- DIASPORE
- ESCAPOLITA
- SPHALERITE
- sphene
- SPINEL
- FLUORITE
- GARNET
- GARNET COLOR CHANGE
- GARNET DEMANTOID
- GARNET SPESSARTITE
- HESSONITE GARNET
- GARNET IMPERIAL
- MALAYA GARNET
- GARNET RHODOLITE
- GARNET TSAVORITE
- GRANDIDIERITE
- GOSHENITA
- HACKMANITE
- HELIODOR
- IOLITE
- KUNZITE
- LABRADORITE
- EMERALD
- MICROCLINE
- MORGANITE
- OPAL
- ORTHOCLASE
- INCA STONE
- PERIDOT
- PEZZOTAITE
- PREHNITE
- QUARTZ
- CITRINE QUARTZ
- SMOKED QUARTZ
- QUARTZ ROSE
- RUTILATED QUARTZ
- QUARTZ TOURMALINE
- RUBY
- RODHONITE
- SILLIMANITE
- SAPPHIRE
- TRIPLITE
- TOURMALINE
- RUBELITE
- ZIRCON
- VESUVIANITE
- CASITERITE
- EPIDOTE
- PARISITE
- RUTILE
- PERICLINE
- AERIGINE
- MONAZITE
- ZOISITAE
- THULITE
- APOPHYLLITE
- SCHEELITE
- BERYLLONITE
- AMBER
-
CABOCHONS
- AERINITE
- AQUAMARINE
- ALBITE
- AMAZONITE
- ALEXANDRITE
- AMETHYST
- AMBER
- APATITE
- BUMBLE BEE
- CHALCEDONY
- KYANITE
- CRISOPRASE
- SPHALERITE
- ESTROMATOLITO
- FLUORITE
- GARNET
- GARNET SPESSARTITE
- STAR GARNET
- DEMANTOIDE GARNET
- MALI GARNET
- GARNET HESONITE
- GARNET TSAVORITE
- GRANDIDIERITE
- HACKMANITE
- IOLITE
- JADEITE
- JASPER
- LAPISLAZULI
- LARIMAR
- MALACHITE
- EMERALD
- OBSIDIAN
- OPAL
- CINTA STONE
- INCA STONE
- MOONSTONE
- SUNSTONE
- PERIDOT
- PIETERSITE
- PYROMORPHITE
- PIROXMANGITE
- PREHNITE
- INCLUDED QUARTZ
- ROSE QUARTZ
- RUBY
- RODOCROSITE
- RODONITE
- SAPPHIRE
- SERAFINITA
- SERPENTINE
- SODALITE
- SUGILITE
- TEFROITE
- THULITE
- TURQUOISE
- TOURMALINE
- UNAKITE
- CAT EYE
- TIGER EYE
- VARISCITE
- CHAROITE
- CARVED MINERALS
-
FACETED GEMS
- JEWELLS
-
MINERALS
- AERINITE
- AQUAMARINE
- AMETHYST
- AMBER
- AMETRINE
- ANGELITE
- AZURITE
- CHALCEDONY
- CITRINE QUARTZ
- DRAVITE TOURMALINE
- ESTAUROLITE
- FLUORITE
- TSAVORITE GARNET
- SPHALERITE
- EMERALD
- RHODOLITE GARNET
- MALI GARNET
- GARNET COLOUR CHANGE
- DEMANTOIDE GARNET
- HESSONITE GARNET
- SPESSARTITE GARNET
- ALMANDINE GARNET
- ANDRADITE GARNET
- GRANDIDIERITE
- MALACHITE
- MORGANITE
- OBSIDIANE
- OPAL
- ORTHOCLASE
- PAISINE
- PERIDOT
- PIRITE
- POLDERVAARTITE
- PREHNITE
- BITERMINATED QUARTZ
- CHIASTOLITE
- RUBY
- RHODOCHROSITE
- TOPAZ
- TOURMALINE SCHORL
- VARISCITE
- ZOISITE AND RUBY
- METEORITES
- FOSSIL
- LOTS
- BLOG