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Browse Items (264 total)
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Dolomite
Formula
CaMg(CO3)2
Structure
Non-silicate
Crystal System
Crystal system: trigonal (-)
Physical Properties
Colour in hand specimen: white, often tinged with yellow or brown Cleavage: rhombohedral Hardness: 3.5-4
Optical…
Apatite
Formula
Ca5(PO4)3(OH,F,Cl)
Structure
Non-silicate
Crystal System
Crystal system: hexagonal (-)
Physical Properties
Colour in hand specimen: green, white, yellow, blue brown etc.Hardness: 5
Optical Properties
Colour in plane polarised…
Fluorite
Formula
CaF2
Structure
Non-silicate
Crystal System
Crystal system: cubic
Physical Properties
Colour in hand specimen: extremely variable: colourless, white, yellow, green, blue and purple most commonCleavage: perfect octahedral, up to…
Halite
Formula
NaCl
Structure
Non-silicate
Crystal System
Crystal system: cubic
Physical Properties
Colour in hand specimen: colourless or white when pure, more typically orange or red due to inclusions of iron compounds, and may also be grey,…
TF0327 Heteromorphic ammonite
Species
Scaphites
Stratigraphic Range
Cretaceous
Taxonomy
Phylum: MolluscaClass: CephalopodaSubclass: AmmonoideaOrder: Ammonitida
Distinctive Features
'g' shaped coiled shellRibsInvoluteAmmonitic suture lines
Preservation
Internal…
TF0326 Ammonite
Species
Anahoplites splendens
Stratigraphic Range
Cretaceous
Taxonomy
Phylum: MolluscaClass: CephalopodaSubclass: AmmonoideaOrder: Ammonitida
Distinctive Features
PlanispiralInvoluteAmmonitic suture patternRibs
Preservation
Internal mould,…
TF0325 Ammonite
Species
Deshayesites
Stratigraphic Range
Cretaceous
Taxonomy
Phylum: MolluscaClass: CephalopodaSubclass: AmmonoideaOrder: Ammonitida
Distinctive Features
PlanispiralAmmonitic suture patternEvoluteRibsAperture
Preservation
Internal mould,…
TF0324 Ammonite
Species
Amoeboceras alternans
Stratigraphic Range
Jurassic
Taxonomy
Phylum: MolluscaClass: CephalopodaSubclass: AmmonoideaOrder: Ammonitida
Distinctive Features
PlanispiralAmmonitic suture lines visible on some mouldsRibs
Preservation
Most…
TF0323 Ammonite
Species
Parkinsonia parkinsonia
Stratigraphic Range
Jurassic
Taxonomy
Phylum: MolluscaClass: CephalopodaSubclass: AmmonoideaOrder: Ammonitida
Distinctive Features
PlanispiralEvoluteRibsAmmonitic suture lines
Preservation
Calcite has replaced…
TF0322 Ammonite
Species
Hildoceras bifrons
Stratigraphic Range
Jurassic
Taxonomy
Phylum: MolluscaClass: CephalopodaSubclass: AmmonoideaOrder: Ammonitida
Distinctive Features
PlanispiralEvoluteRibs
Preservation
Mineral replacement of shell (aragonite to…