Bob Williams (UK) Chert and flint are crystalline (perhaps more accurately described as microcrystalline) forms of rock that man has made use of from Stone Age times. The crystals consist of a microcrystalline form of silica, more commonly known as quartz (silicon dioxide). Flint is the better-known form of this… … Read More
Tasman Walker (Australia) Scattered over Koekohe Beach on the South Island of New Zealand, dozens of huge spherical boulders look like the remains of a monster game of marbles. These were recently featured on the cover of Issue 22 of Deposits. The grey, stone balls are a fascinating tourist attraction,… … Read More
Terry Moxon (UK) Quartz has been estimated to occupy around 12% of the earth’s crust and can be found in many forms, ranging from the massive, clear crystals of quartz and amethyst to the microcrystalline quartz that is to be found in jasper, agate, chalcedony, chert and flint. World-wide, the… … Read More
Dr David Penney and Dr David Green (UK) This is the second in a series of articles concerning fossils in amber. In the first, we focused on the biodiversity of organisms in the major deposits of the world, including the techniques available for distinguishing genuine fossils from fakes (see Fossils… … Read More
Dr David Penney and Dr David Green (UK) It is almost two decades since the original blockbuster movie, Jurassic Park, brought the existence of fossil insects in amber (fossilised tree resin) into the limelight. Since then, numerous books and research papers have been published. Fossiliferous amber deposits are still being… … Read More
Steven Marquez (USA) The specimen displayed is a variety of microcline feldspar, referred to as amazonite. Many jewellers love this mineral for making cabochons because of its brilliant colour, which is thought to be caused by traces of lead and water. The gemstone is called the “Stone of Hope”, because… … Read More
Trevor Devon (UK) At some time, I suppose we have all collected rocks or minerals when we were travelling to new places, mostly as mementos, but nothing quite beats the buzz of collecting specific minerals from classic locations with like-minded colleagues. This type of collecting implies you know something of… … Read More
Dr Robert Sturm (Austria) Compared to the geological architecture of other European countries not exceeding a total area of 100,000km², the geology of Scotland is characterised by an unusual diversity of geological features. Due to its tectono-metamorphic complexity Scotland attracted numerous earth scientists in the eighteenth and nineteenth centuries, whose… … Read More
Steven Marquez (USA) Amethyst is the violet to purple variety of quartz. It is often associated with albite and orthoclase in pegmatites. Fine specimens of amethyst can be classified as semiprecious gemstones. This specimen was found in Cripple Creek Colorado, as a near surface deposit on the David Leighton gold … Read More
I have been fortunate enough to review for this magazine a large number of books from the Dunedin series of guides introducing aspects of the different sciences, especially the earth sciences. And Introducing Mineralogy continues the high standard set by its predecessors. It is slightly larger than some of the other guides in the series, but is still beautifully illustrated, nicely written and very informative.
These three guides by Robert Westwood are in the same simple format. All are local geological guides to specific areas of the UK and all are illustrated by lovely full colour photographs. They all contain simple, introductory geological introductions for the uninitiated, and then more detailed expositions of what makes the regions so special.
This is the fourth book in a series published by Dunedin that I have been lucky enough to review – the others being on palaeontology, geology and volcanology. And this is as good as the others. However, it is not an easy book to read.
Normally, I wouldn’t be interested in semi-precious stones and other pretty things. Personally, I prefer grubbing around in the dirt, perhaps for those far more beautiful, elusive and perfectly formed Cretaceous terebratulids or Silurian trilobites. However, some semi-precious stones have the advantage of also providing a tangible link to the ancient history of life.
Nowadays, people don’t do geology – they do ‘earth sciences’ – and this book is very much in that mould. That’s not to say this is a problem.
Deposits magazine has covered the science and appeal of agate in some detail over the last few years. Indeed, this issue has another in Wayne Sukow’s excellent series on the science of Lake Superior agate formation.
Here at Deposits, we like our amber and this certainly isn’t the first book on the subject I have reviewed. In fact, over the years, we have published many articles on the fossilised sap and its inclusions, and have just finished publishing a short, two-article series by the authors of this excellent little publication.
Over a period of 20 years, Ian Tyler has written a series of books on the metalliferous mining industry of the English Lake District and this has clearly been a significant labour of love for him.
Terry Moxon likes his agates. It is easy to see his enthusiasm and it is just as easy to appreciate it from this short book on the science of these colourful minerals. However, his is not just a casual interest.
For many years, the Geologists’ Association has published some of the best geological guides to the UK (and a few other places). This new one, the 67th in the series, covers the Dalradian of Scotland.
The island of Cyprus is a truly classic area of geology in Europe. Perhaps nowhere else on Earth does so small an area provide such an excellent illustration of the dynamics of Earth processes through abundant exposures of spectacular and diverse geology.
The Caithness area of Scotland is important for its geology, but is also well known for its palaeontology. The area even once had its own ‘gold rush’ and you can still try your luck at panning there today at Kildonan.
For a long time Watchet has been known to be a superb location for those interested in both fossils and geology but surprisingly, the location has had little in the way of media attention. However, within the last couple of years, this area has begun to attract a lot of interest and this book will further increase its growing popularity.
Minerals of Britain and Ireland is a comprehensive account of the minerals found in Britain, Ireland and the surrounding islands. At over 600 pages and illustrated throughout by over 550 images (mostly in colour), the book provides exhaustive coverage of the remarkably wide range of minerals found in this part of the world.
Dorling Kindersley (DK) are well-known for producing popular reference media for beginners and enthusiasts. No doubt, most readers will be familiar with their ‘Eyewitness Guides’. The Eyewitness Handbook of fossils, certainly makes a useful starting point for anyone new to geology or palaeontology.