Igneous Collection (page 2)

Tenorite is comprised of (copper oxide). It is found as grey to black metallic crystals and as a by-product of lava flows. Fibrous specimen from the Natural History Museum, London

Volcanic Activity
Block diagram showing various types of volcanic activity. One of a series of diagrams (including image numbers 185 to 190) showing volcanic activity

Igneous activity
A block diagram depicting various types of igneous activity. Fig 65 from The Story of the Earth (1977), a Geological Museum booklet

Lava-flow from Edinburgh volcano
A specimen of lava-flow that erupted from the haunch vent down the flanks of the volcano to its present resting place on Whinny Hill

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

Oceanic and continental crust
A cross section of the Earths surface showing the continental crust on the left and oceanic crust on the right. Beneath the surface layer lies the Basaltic layer (in green) and the Mantle (in grey)

Anorthosite breccia, moon rock
Specimen of anorthosite breccia or moon rock collected on the Apollo 16 mission in April 1972, and mounted in an acrylic block for protection and display

The cliff edge engine houses of Wheal Trewavas
Situated on the Tregonning granite at Trewavas Head, south Cornwall. Image used in Minerals of Cornwall and Devon by P.G. Embrey and R.F. Symes, 1987, page 40. See also 4072

Gersdorffite comprises of (nickel arsenic suphide). It is associated with hydrothermal veins and magma derived from sulphite deposits. Specimen from the Natural History Museum, London

Unakite

Obsidian specimen

Agglomerate
An agglomerate is a rock formed of angular volcanic fragments. Specimen from Volcanoes 2nd edition fig 57 (top)

Plate XXXVIII: Lava curtain and royal party
Pl XXXVIII. Observation on the volcanoes of the two Sicilies, Naples, 1776 & 1779 compiled by Sir William Hamilton (1730-1803) while Ambassador to the Kingdom of Naples

Observing structure of rock
Looking at fresh granite under a microscope to study structure, granular composition can clearly be seen

Platyphysa prinsepi, freshwater snails
65 million year old freshwater snail specimens that were engulfed by lava flows. Originating from the Late Cretaceous, Nagpur, India

Krakatoa in eruption
Krakatoa during an early stage of the eruption. Plate 1 from The Eruption of Krakatoa (1888) by G. J. Symons

Subduction zone
An illustration of a subduction zone at work beneath the South American continent. Fig 20 from The Story of the Earth 1977, London

Oceanic subduction zone with island arc
This diagram shows a destructive plate margin, an oceanic subduction zone accompanied by a volcanic island arc

Devonian landscape
An impression by Bridget Kempster of the Old Red Sandstone desert of the Devonian period (417 to 354 million years ago)

Volcanic eruption
A flood basalt eruption. One of a series (including image numbers 185 to 190) showing various forms of volcanic eruption

Granite from Ailsa Craig
A photomicrograph of granite taken between crossed polarisers. Granite is an igneous rock

Porphyry Mine in Lessines, Belgium
Mine / Quarry for Porphyry at Lessines, Belgium. Porphyry is a variety of igneous rock consisting of large-grained crystals, such as feldspar or quartz

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