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Idaho
Minerals
The Complete Reference and Guide to the Mineralsof Idaho
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With Special Chapters on the Coeur d'Alene Mining District, the Blackbird Mining District, and the Sawtooth Mountains. 2nd Edition, Revised and Updated by Lanny R. Ream
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384 pages,
6"x 9", index
Softbound, $27.95 ISBN 0-9723356-3-3
Descriptopn
Contents
Excerpt
Author
Reviews
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Excerpt from the Book:
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Preface
This reference, the second edition of Idaho Minerals,
was written for the purpose of making the information on the mineralogy
of Idaho available to all those who are curious about the natural world,
study minerals or collect minerals. It is an on going project that will
never be complete - new information will continue to be discovered and those
who have knowledge that hasn't been published or otherwise passed on to
others will become known to the author and others who will pass it on. The
author investigates and studies the mineralogy of Idaho and will continue
to do so, and expects to publish a third edition of this book.
Although the information in these pages can be useful
as a guide to the mineral occurrences of the state for those who are interested
in investigating them or collecting mineral specimens, no effort was made
to record and explain complete information on ownership and accessibility
of the land for each mineral occurrence. The reason being that this book
was not prepared to be a field guidebook. Obtaining and maintaining ownership
and access information is a time consuming process. Ownership often changes
as does access, lands are sold, gates are installed or removed and access
roads wash out or deteriorate. Access and ownership information has been
included when it was available and believed to be accurate, but no effort
was made to ensure this accuracy at the time of publication. It is the responsibility
of the individual to determine ownership and right of access before entering
any mineral location, mine or other land or property.
Information was obtained from many different sources.
All the information that was in the first edition has been included in
the second edition. This information has been corrected where needed and
updated with new information where available. In addition, much new information
has been learned by direct field investigation and laboratory analyses and
identification of minerals, the viewing of specimens and by written and
verbal communications with others. All entries have a reference of the source,
be it a publication, or a listing that it was obtained by the authorâs
personal knowledge as described in the preceding sentence. For the first
edition, an extensive literature search provided much information. For the
second edition, an extensive search for new publications was not done, this
edition is primarily information obtained by the author through personal
contact and investigations.
Being that this book is part of an ongoing investigation
and study of the mineralogy of the state of Idaho, all comments and information
on the minerals of the state are welcome. From various studies and comments,
39 new mineral listings, many for minerals new to the state, and dozens
of new listings have been added to this edition over what was in the first
edition.
BIOTITE
K(Mg,Fe)3(Al,Fe)Si3O10(OH,F)2, monoclinic Tabular or short prismatic
crystals or foliated masses; perfect cleavage so that it may be separated
into thin sheets. Dark green, brown to black. A common accessory mineral
in igneous rocks and some gneisses and schists.
Boise, Custer and Elmore Counties: Biotite appears to be rare in the
granite of the Sawtooth Mountains. Most of the dark mica group minerals
are masutomilite or zinnwaldite. The dark mica in one cavity apparently
has proven to be biotite, and may be present in others. In this cavity,
it forms small books and flakes with microcline, albite and smoky quartz.
Lemhi County: Biotite forms well-developed rosettes in the cobalt mines
in the Blackbird District. It is a common rock-forming mineral in the host
rocks of the ore deposits. Fine specimens have been found in the Togo Mine
(Shannon, 1926).
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Author:
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Lanny
Ream
Lanny Ream has been interested in minerals all his life and carried
an early interest in minerals, rocks and fossils with him to college, earning
a Masters Degree in Economic Geology. After working for several years as
a mineral exploration geologist, then as a geologist and mineral examiner
for the Bureau of Land Management and US Forest Service, Lanny decided to
continue working with mineral-related subjects, including the founding and
publishing of Mineral News, a monthly newsletter for mineral collectors,
which he edited and published for more than 18 years before selling it.
He continues to explore and write about mineral localities of the Pacific
Northwest with an emphasis on the mineralogy of the states of Idaho and
Montana.
This second edition of Idaho Minerals is the result
of an additional 15 years of studying the mineralogy of Idaho after publishing
the first edition in 1989. This volume shows his dedication to this subject
by the addition of many minerals identified for the first time in Idaho due
to his field work and studies.
Other books by the author include the guide to Washington
minerals and lapidary materials, now in its 28th year of publication: Gems
and Minerals of Washington; Northwest Volcanoes (a guide to volcanoes in
the Northwest states and British Columbia and Gem and Mineral Collectorâs
Guide to Idaho.
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