Plate 1. Top row left to right: Pink tourmaline, round brilliant cut: yellow topaz, step cut rectangle; pink tourmaline, scissor cut rectangle; Tropical Green from India- classified as a grey granite, course grained with essential minerals blue quartz and grey feldspar, accessory minerals are hornblende and mica. Middle row, left to right: Tarn from France - Quartz/biotite granite; Sapphire Brown from India - pink porphyritic granite, essential minerals quartz and orthoclase feldspar with perfect cleavage; Bahama Blue from India - course grained granite, equigran- ular, quartz and feldspar essential and hornblende as accessory; Balmoral Red from Sweden - quartz/biotite gran- ite. Bottom row, left to right: Ruby Red from India - pink pegmatite, quartz and pink felspar are essentials, no accessories; Paradiso from India - fine grained grey granite, essential minerals are quartz and orthoclase feldspar, accessories are rare with a few minute flakes of mica; Star Galaxy from India - medium grained diorite, plagioclase and pyroxene in equal pro- portions; Blue Pearl from Norway - larvikite with crystals of labradorite.
Pictures of cut stones www.customgemstones.com Pictures of Rock samples Lidster stonemasons: www.lidster.co.uk Plate 2. Overall winner and feature category. Sea Stack, Cathedral Cove, New Zealand. Ignimbrite of the Whitianga Group Rhyolites. Linda McArdell Plate 3. Winner of geologically inspired landscape category: Lower lias limestone cliffs, overlying a Lower Lias platform, Southerndown, Glamorgan Lisa Duff
Plate 4. Winner of Geological humour category. Bareback riding on a Carnosaurus, Scilly Isles. Pauline Kirtley Plate 5. Above: Satellite image of Tenerife showing many geological features. Much of the pink colour is man- made constructions. The yellow-green colour is mostly vegetated areas, the pale green tear-drop in the Las Cañadas Caldera is the El Tabonal negro lava flow, other lava flows are also distinguishable. (Image NASA 2000) Below: satellite image of Mount St Helens showing the characteristic ‘Horse shoe’ amphitheatre of avalanche calderas. ( NASAA)