earth science

Takedaite

Takedaite is a earth science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Takedaite rather than just read about it. In short: Takedaite is a borate mineral that was found in a mine in Fuka, Okayama Prefecture Japan during a mineralogical survey in the year 1994. During the survey, Kusachi and Henmi reported the occurrence of an unidentified anhydrous borate mineral closely associated with nifontovite, olshanskyite, and calcite.

Key takeaways

Takedaite belongs to earth science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Takedaite to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Takedaite from memory before moving on to harder problems.

Reference excerpt

Takedaite is a borate mineral that was found in a mine in Fuka, Okayama Prefecture Japan during a mineralogical survey in the year 1994. During the survey, Kusachi and Henmi reported the occurrence of an unidentified anhydrous borate mineral closely associated with nifontovite, olshanskyite, and calcite. By the year 1994 two other minerals in the borate group M3B2O6 had been identified in nature Mg3B2O6 known as kotoite and Mn3B2O6 known as jimboite. Takedaite has the ideal chemical formula of Ca3B2O6. The mineral has been approved by the Commission on New Minerals and Mineral Names, IMA, to be named takedaite after Hiroshi Takeda, a professor at the Mineralogical Institute, University of Tokyo Japan.

Occurrence Takedaite is found in association with gehlenite, spurrite, bicchulite, rankinite, kilchoanite, oyelite, and fukalite. It occurs in a vein consisting of borate minerals that developed along the boundary between crystalline limestone and the skarns. The vein it was discovered in was approximately 10 cm in thickness and is closely associated with frolovite and calcite. At the circumference of the expanded area, hydrous borates such as nifontovite, olshanskyite, sibirskite, and pentahydroborite occurred 20 cm to 50 cm in thickness.

Physical properties Takedaite is a white, or pale gray mineral with a vitreous luster and colorless in thin sections. It exhibits a hardness of 4.5 on the Mohs hardness scale. The density measured by heavy liquids was 3.10(2) g•cm−3, the calculated density being 3.11 g•cm−3.

Optical properties Takedaite is optically uniaxial Negative. The refractive indices are: ω = 1.726, ε = 1.630, and the Vickers microhardness was 478(429-503) kg mm−2 (25g load). The infrared spectrum of Takedaite measured by the KBr method for the region 4000 to 250 cm−1. The absorption bands at 907, 795, 710, and 618 cm−1 were in close agreement with those of the synthetic 3CaO·B2O3 reported by Wier and Schroeder (1964). The absorption bands at 1275 and 1230 cm−1 for takedaite were sharper.

Chemical properties Takedaite is a borate with the presence of calcium, boron and oxygen. Chemical analysis gave CaO 71.13%, B2O3 28.41%, the H2O content was determined by ignition loss at 900 °C and was 0.14%, totaling 99.68%. The empirical formula calculated on the basis of O=6 is therefore Ca3.053B1.965O6 or more ideally Ca3B2O6. Takedaite is also easily soluble in dilute hydrochloric acid.

Chemical composition

X-ray crystallography The x-ray powder data for takedaite was obtained by an X-ray diffractometer using Ni-filtered Cu-Κα radiation. Single crystals were also studied using the precession and Weissenberg methods. Takedaite is in the trigonal crystal system. The space group is either R3c or R3c. The unit cell dimensions, refined by least squares from the X-ray powder diffraction data of takedaite, were: a = 8.638(1) Å, c = 11.850(2) Å.

Illustrations

Worked examples

Example 1 — a first encounter with Takedaite

Start with the simplest possible case. Write down what Takedaite claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Takedaite before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Takedaite ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Takedaite

In research: Takedaite appears in earth science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Takedaite in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Takedaite is common in secondary-school and first-year university syllabi. It links to neighbouring topics Borate minerals, Calcium minerals, Minerals described in 1994, so understanding it makes those chapters shorter.
In everyday life: Look for Takedaite outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Takedaite in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Takedaite means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Takedaite out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Takedaite in simple terms?

Why does Takedaite matter?

Because it connects several earth science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Takedaite?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Takedaite.