Minerals are the building blocks of rocks – they make up the solid Earth’s crust. Understanding Minerals & Crystals takes a close look at minerals, how they form, why they differ and how to go about identifying them.

It begins by examining the nature of atoms and the way they bind together to form minerals with distinctive crystal structures; and it discusses the nature and classification of these crystals, and includes a mineral identification key.

The second part of the book contains detailed descriptions of some 80 common and important minerals, including how they were named, their properties, ID pointers, uses and where in the world they are found. All are lavishly illustrated with full-colour photographs.

This book will be invaluable to those interested in any of the earth sciences, or in mineral/crystal collecting – from academics and students to general enthusiasts.

This is a richly illustrated reference book that provides a unique, comprehensive, and up-to-date survey of the rocks and structures of fault and shear zones. These zones are fundamental geologic structures in the Earth's crust. Their rigorous analysis is crucial to understanding the kinematics and dynamics of the continental and oceanic crust, the nature of earthquakes, and the formation of gold and hydrocarbon deposits. To document the variety of fault-related rocks, the book presents more than six hundred photographs of structures ranging in scale from outcrop to submicroscopic. These are accompanied by detailed explanations, often including geologic maps and cross sections, contributed by over 125 geoscientists from around the world. The book opens with an extensive introduction by Arthur W. Snoke and Jan Tullis that is itself a major contribution to the field. Fault-related rocks and their origins have long been controversial and subject to inconsistent terminology. Snoke and Tullis address these problems by presenting the currently accepted ideas in the field, focusing on deformation mechanisms and conceptual models for fault and shear zones. They define common terminology and classifications and present a list of important questions for future research. In the main, photographic part of the book, the editors divide the contributions into three broad categories, covering brittle behavior, semi-brittle behavior, and ductile behavior. Under these headings, there are contributions on dozens of subtopics with photographs from localities around the world, including several "type" areas. The book is an unrivaled source of information about fault-related rocks and will be important reading for a broad range of earth scientists, including structural geologists, petrologists, geophysicists, and environmental specialists. Originally published in 1998. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.

The Evolution of the Igneous Rocks, by N. L. Bowen, appeared in 1928 and had a profound influence on later generations of petrologists. Drawing on his series of lectures at Princeton University in the spring of 1927, Dr. Bowen identified, outlined, and applied the principles of physical chemistry relevant to petrological processes. Whereas the major petrochemical questions he discussed are still relevant today, the answers appear to change with time. The purpose of the present volume is to provide an updated view of those questions, in the light of almost fifty years of accumulated observations, using the principles Bowen set forth. Originally published in 1979. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.

Our lives are pretty stressful, from the mountains of work emails to the never-ending life admin, finding time to see friends and family whilst still getting in those gym workouts, and why does everyone on Instagram have all this figured out. Working with crystals is a way to slow that frenetic world down, realign your intentions and find the inner calm we all seek. Some say that crystals are magic, but they're more than just magic. They have the power to reveal your truest self, the version of you that's been waiting to be seen and acknowledged. The Crystal Code explains how to the harness the power of these awesome rocks, introducing us to seventy stones and their unique personalities. It will show you how to find the perfect crystals to empower and energize you and will teach you some easy rituals, meditations and crystallized self-care routines. Whether it's peacock ore to give you more confidence on that nerve-racking first date, white celestite to conquer anxiety or purple amethyst to you help you feel centred, this is the ultimate guide to regaining control of your life and to feeling happier, healthier and more grounded.

The two most fascinating questions about extraterrestrial life are where it is found and what it is like. In particular, from our Earth-based vantage point, we are keen to know where the closest life to us is, and how similar it might be to life on our home planet. This book deals with both of these key issues. It considers possible homes for life, with a focus on Earth-like exoplanets. And it examines the possibility that life elsewhere might be similar to life here, due to the existence of parallel environments, which may result in Darwinian selection producing parallel trees of life between one planet and another. Understanding Life in the Universe provides an engaging and myth-busting overview for any reader interested in the existence and nature of extraterrestrial life, and the realistic possibility of discovering credible evidence for it in the near future.

Bei den gegenwartigen Diskussionen iiber globalgeologische und petrologi- sche Probleme des mittelatlantischen Riickens spielt Island eine ausschlagge- bende Rolle. Gemessen an der Bedeutung der Vulkaninsel fUr diese zentralen Fragen sind die Gesteine Islands jedoch sehr selektiv erforscht. Relativ gut bekannt sind vor allem die Produkte der heute tatigen Vulkane. Uber den Chemismus, die mineralogische Zusammensetzung und den Autbau der prahistorischen und vor allem der tertiaren Vulkanite, welche die Offnung des Atlantiks miterlebt haben, sind wir jedoch bloss punktuell informiert. Riesige Areale der Insel bilden in petrographischer und petrochemischer Hinsicht heute noch terra incognita. Da sich nur wenige Forscher dauemd mit dem Thema Island beschaftigen konnen und da sich diese Kollegen immer wieder Fragestellungen der Vulkaneruptionen des Tages zuwenden miissen, sollte sich die grosse Zahl von Erdwissenschaftem, welche die Insel fUr kurze Zeit besuchen, verpfiichtet flihlen, nach Moglichkeit Beitrage zu liefem und Liicken in unserer Kenntnis auszufUllen. In diesem Sinne ist unser Beitrag zu verstehen. Er entstand im Anschluss an Islandexkursionen in den Sommem 1971 und 1973 und befasst sich mit Material, das damals sowie auf friiheren Reisen des einen von uns (E. W.) gesammelt wurde. Die zwei genannten Exkursionen dienten der Einflihrung vorgeriickter Studierender und wissenschaftlicher Mitarbeiter von schweizerischen Hochschulen in Probleme des Vulkanismus.

This guide provides concise, interesting and practical details on uncommon gems that are now being used by designers to create distinctive jewelry. It not only lists the identification properties of the gems, but tells you where they are found, how they are used, why they are unique, how they are priced, and how to care for them. High quality photos show the different colors, cutting styles and varieties of each gem and give you ideas on how each can be used creatively in jewelry. Written in a succinct, user-friendly style, this is a companion book to Newman's "Gemstone Buying Guide" and an ideal reference for jewelers, sales associates, appraisers, gem collectors, gemology students, gem dealers and consumers. The following gems are discussed and illustrated in Rare Gemstones: amblygonite, andalusite, apatite, aragonite, axinite, azurite, benitoite, bixbite, brazilianite, bronzite, calcite, cobaltocalcite, charoite, chrysocolla, cuprite, danburite, diaspore, diopside, dumortierite, enstatite, epidote, fluorite, gaspeite, hauyne, hematite, hemimorphite, howlite, idocrase, jeremejevite, kornerupine, kyanite, larimar, lepidolite, magnesite, marcasite, maw-sit-sit, moldavite, obsidian, pectolite, phenakite, phosphosiderite, prehnite, psilomelane, pyrite, red beryl, rhodochrosite, rhodonite, scapolite, scheelite, seraphinite, serpentine, sodalite, sillimanite, smithsonite, sphalerite, sphene, sugilite, taaffeite, titanite, tugtupite, unakite, variscite, vesuvianite and zultanite.

In Erganzung zu den bisher durchgefuhrten experimentellen Unter- suchungen an konkaven Wanden wurde hier besonders angestrebt, den unmittelbaren Einfluss der Langswirbelstoerung auf den laminar-tur- bulenten Umschlag herauszufinden. Es musste daher versucht werden, andere Stoerungen, wie die Tollmien-Schlichting-Wellen, moeglichst zu vermeiden. Dies gelang weitgehend durch die Wahl besonders stark gekrummter Wande (R=O,5mund R= I m), in deren Grenzschicht die durch die Zentrifugalkraft hervorgerufene Instabilitat so stark ist, dass bei kleinen Geschwindigkeiten die laminare Stroemung bereits ge- gen gegenlaufig rotierende Langswirbelpaare instabil wird und in Tur- bulenzumschlagt, ehe sienach der linearisierten Theorie gegenTollmien- Schlichting-Wellen instabil wird. Beider Durchfuhrung der Versuche wurden zunachst mit der Wasser- stoffblaschenmethode die Stoerungen sichtbar gemacht, die sich auf naturliche Weise in der instabilen Grenzschicht entwickeln. Sie zeigen dreidimensionalen Charakterund weisen die inderTheorieangenommene Periodizitat in Spannweitenrichtung auf. Dasselbe Ergebnis stellte sich ein, alsderAnstroemungdurch einSieb vor dem Modell beliebigeAnfangs- stoerungen in isotroper Verteilung uberlagert wurden. Die durch diese Anordnung erwirkte groessere Regelmassigkeit des Stroemungsfeldes er- moeglichte es, zu den jeweiligen Versuchsbedingungen die Wellenlange der Langswirbelstoerung zu bestimmen. Es konnte dazu eine durch die linearisierte Theorie erklarbare Abhangigkeit der Wellenlange von der Anstroemgeschwindigkeit und der Modellkrummung festgestellt werden.