Metamorphic Collection

Unloading Coal 1930S
Unloading anthracite coal at Bristol docks, Gloucestershire, England. A metamorphic rock, anthracite is almost smokeless and is used to make high grade steel

Mica schist is a rock resulting from the metamorphism of shale. Specimen originates from Grantown-on-Spey, Murrayshire

Schist
A garnet schist from Moidart, Scotland. This specimen is a medium-grained metamorphic rock

Shale (right) and garnet-mica-schist (left)
Shale is sedimentary and garnet-mica-schist is metamorphoc in origin. Specimen held at the Natural History Museum, London

Table top of ancient Roman Marbles
This Roman table top is inlaid with large variety of ornamental marble excavated from tombs on Appian Way, a road constructed from Rome to Capua by Appius Claudius Caecus in 312 BC

Garnet-topped doublet
A green garnet-topped doublet. Garnets are common in metamorphosed rocks and also in some igneous formations

Tourmaline cut stones see 666
A group of tourmaline cut stones. Tourmaline is the name given to a group of eleven minerals which all have a general chemical formula

Gneiss is a metamorphic rock. This specimen held at the Natural History Museum, London

Spinel specimen
Spinel crystals from Vietnam. The rock has been chipped away to reveal the well-defined crystals

Cordierite-biotite-gneiss
Geological specimen collected by Scotts British Antarctic Expedition 1910-1913, also known as the Terra Nova expedition. It had a broad scientific programme and collected thousands of geological

Natural ruby in marble
From the mines of Mogok in Burma (Myanmar). Ruby is the red variety of the mineral corundum with small impurities of chromium that turn it red

Breccia Coralina Rosa, marble
Polished specimen of the metamorphic rock marble from a ruin of ancient Rome

Africano Sanguigno, marble
Polished specimen of the metamorphic rock marble from a ruin of ancient Rome

Marble, Breccia Coallina Rosa
Specimen number BM 82645, from the Ruins of Ancient Rome

Marble, Breccia Sanguigna
Specimen number BM 50289, from Saxony

The Beardsley H5 ordinary chondrite
Beardsley fell in Kansas, U.S.A in 1929. Its fine-grained texture, with poor chondrule resolution indicate that it has experienced thermal metamorphism

Marble, Africano Sanguigno
Specimen number BM 82628, from the Ruins of Ancient Rome

Garnetiferous schist
Schist is a metamorphic rock, and this specimen show large formations of the gemstone garnet

Travertine is a decorative rusty coloured limestone marble from Spain. Marble is metamorphosed limestone

Ammonite marble
Asteroceras (large shells) and Promicroceras (small shells) ammonites, seen here in the polished surface of a specimen of marble originating from the Lower Lias, near Yeovil, Somerset

Limestone (right) and marble (left)
Limestone is sedimentary and marble is metamorphic in origin. Specimen held at the Natural History Museum, London

British marble specimens

Common rock types
A collection of common rock types - left to right - Igneous (granite), sedimentary (sandstone) and metamorphic (schist)

Axinite

Garnets
Faceted garnets showing a range of colours. Garnet is the birthstone of January

Lapis lazuli
Beads of lapis lazuli, with rough lapis lazuli, from Afghanistan. Lapis lazuli (sodium calcium aluminum silicate sulphur sulphate) is a rich blue opaque, semi-precious stone

Ruin marble
Ruin Marble, when polished resembles ruins of buildings. This specimen originates from the Val d Arno, Fiorentino, Florence, Italy

Slate
Cambrian slate from North Wales. Slate is metamorphosed shale

Quartzite

Lapis lazuli from Afghanistan
Polished slab of lapis lazuli containing some brassy-coloured pyrite. Lapis lazuli (sodium calcium aluminum silicate sulphur sulphate) is a rich blue opaque, semi-precious stone

Belt-hook in lapis lazuli
Carved chinese belt-hook on a piece of rough lapis lazuli from Badakhstan. Lapis lazuli (sodium calcium aluminum silicate sulphur sulphate) is a rich blue opaque, semi-precious stone

Lapis lazuli from Siberia
A polished slab of Siberian Lapis lazuli containing white calcite and some brassy pyrite. Lapis lazuli means blue rock, with the rich colour due to the sulphur in its composition

Marble

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