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Hematite (/ ˈ h iː m ə ˌ t aɪ t, ˈ h ɛ m ə-/), also spelled as haematite, is a common iron oxide compound with the formula, Fe 2 O 3 and is widely found in rocks and soils. [6] Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of Fe 2 O 3. It has the same crystal structure as corundum ...
Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 v
In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
The term “Penghu Wenstone” first appeared in historical documentations the first year of the Qianlong reign of the Qing Dynasty (1736). At that time, the local magistrate Zhou Yuren mentioned Penghu Wenstone in the “Brief History of Penghu” and described it as follows: “Penghu yields the Wenstone, extracted through the process of excavating and cleaving rocks at the foothills of Waiqian.
The flora shows links with both Madagascar to the south and the African mainland to the west. Having been so isolated the islands are rich in endemic plant life including palm trees such as the coco de mer. [5] The Granitic Seychelles have a relatively low number of flowering plant species, but a high rate of endemism.
The physical and chemical properties of the Shoofly Oolite are the setting for a suite of rare plants, which the BLM protects through land use management and on-site interpretation. This type of limestone is also found in Indiana in the United States. The town of Oolitic, Indiana, was founded for the trade in limestone and bears its name.
Thermophilous scrub of the Canary Islands: Anaga. This is the large North-facing slope of the hill, planted with the local flora native to the neighbouring mountain chain of Anaga. There are all types of native species, including narrow endemics and native trees, and abundant Canary Islands date palms, Phoenix canariensis. Madagascar.
A rough specimen of bloodstone. Heliotropes (from Ancient Greek ἥλιος (hḗlios) 'sun' and τρέπειν (trépein) 'to turn') (also called ematille, Indian bloodstones, or simply bloodstones) are aggregate minerals, and cryptocrystalline mixture of quartz that occurs mostly as jasper or sometimes as chalcedony (translucent).
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