1. |
Chips from the Quarry |
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Rocks & Minerals,
Volume 74,
Issue 5,
1999,
Page 291-294
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ISSN:0035-7529
DOI:10.1080/00357529909602555
出版商:Taylor & Francis Group
年代:1999
数据来源: Taylor
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2. |
Letters |
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Rocks & Minerals,
Volume 74,
Issue 5,
1999,
Page 295-297
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ISSN:0035-7529
DOI:10.1080/00357529909602556
出版商:Taylor & Francis Group
年代:1999
数据来源: Taylor
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3. |
Geo-Currents: A Look at Recent Geological News, Coral |
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Rocks & Minerals,
Volume 74,
Issue 5,
1999,
Page 298-299
JaneM. Matty,
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ISSN:0035-7529
DOI:10.1080/00357529909602557
出版商:Taylor & Francis Group
年代:1999
数据来源: Taylor
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4. |
Twins: Crystal Curiosities |
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Rocks & Minerals,
Volume 74,
Issue 5,
1999,
Page 300-307
Werner Lieber,
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ISSN:0035-7529
DOI:10.1080/00357529909602558
出版商:Taylor & Francis Group
年代:1999
数据来源: Taylor
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5. |
The Four Twin Laws of Calcite and How To Recognize Them |
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Rocks & Minerals,
Volume 74,
Issue 5,
1999,
Page 308-317
R.Peter Richards,
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摘要:
Calcite collectors often ask, “How many kinds of calcite twins are there?” The answer is hard to give because the wordkindsis ambiguous. The question can be given an unambiguous answer, however, if the question is rephrased: “How many twin laws are there for calcite?” In this case, the answer is “four.” I will go further and assert that there are four, and only four, twin laws for calcite. The rest of this article will be spent explaining my answer and providing enough information that an observant collector should be able to tell whether a calcite crystal is twinned or not and to determine which of the four twin laws is represented. The basics of calcite crystallography are well covered in the excellent article by Brock (1993), and basic aspects of twinning are covered by Werner Lieber elsewhere in this issue.
ISSN:0035-7529
DOI:10.1080/00357529909602559
出版商:Taylor & Francis Group
年代:1999
数据来源: Taylor
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6. |
Chinese Beryl Crystals Mimic Twinning |
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Rocks & Minerals,
Volume 74,
Issue 5,
1999,
Page 318-320
JohnS. White,
R.Peter Richards,
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ISSN:0035-7529
DOI:10.1080/00357529909602560
出版商:Taylor & Francis Group
年代:1999
数据来源: Taylor
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7. |
Observations on the Strenght of Twin Planes |
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Rocks & Minerals,
Volume 74,
Issue 5,
1999,
Page 321-323
JohnS. White,
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ISSN:0035-7529
DOI:10.1080/00357529909602561
出版商:Taylor & Francis Group
年代:1999
数据来源: Taylor
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8. |
Connoisseur's Choice: Chrysoberyl, Minas Gerais and Bahia, Brazil, and Takovaya, Russia |
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Rocks & Minerals,
Volume 74,
Issue 5,
1999,
Page 324-327
RobertB. Cook,
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ISSN:0035-7529
DOI:10.1080/00357529909602562
出版商:Taylor & Francis Group
年代:1999
数据来源: Taylor
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9. |
From Minerals to Art |
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Rocks & Minerals,
Volume 74,
Issue 5,
1999,
Page 328-331
Susan Robinson,
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ISSN:0035-7529
DOI:10.1080/00357529909602563
出版商:Taylor & Francis Group
年代:1999
数据来源: Taylor
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10. |
Illuminating the Present |
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Rocks & Minerals,
Volume 74,
Issue 5,
1999,
Page 332-333
PeterI. Russell,
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ISSN:0035-7529
DOI:10.1080/00357529909602564
出版商:Taylor & Francis Group
年代:1999
数据来源: Taylor
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