earth science

Raygrantite

Raygrantite 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 Raygrantite rather than just read about it. In short: Raygrantite is a mineral first discovered in Big Horn Mountains, Maricopa County, Arizona, US. More specifically, it is located in the evening star mine, which is a Cu, V, Pb, Ag, Au, and W mine.

Key takeaways

Raygrantite 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 Raygrantite to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Raygrantite from memory before moving on to harder problems.

Reference excerpt

Raygrantite is a mineral first discovered in Big Horn Mountains, Maricopa County, Arizona, US. More specifically, it is located in the evening star mine, which is a Cu, V, Pb, Ag, Au, and W mine. Raygrantite is a member of the iranite mineral group, which consists of hemihedrite, iranite, and raygrantite. This mineral received its name in honor of Raymond W. Grant, a retired professor who primarily focused on the minerals of Arizona. The typical crystal structure of raygrantite is bladed with parallel striations to the C axis. Its ideal chemical formula is Pb10Zn(SO4)6(SiO4)2(OH)2. The IMA (International Mineralogical Association) approved raygrantite in 2013, and the first publication regarding this mineral was put forth in 2017.

Occurrence Raygrantite is associated with cerussite, galena, mattheddleite, lanarkite, leadhillite, anglesite, alamosite, hydrocerussite, diaboleite, and caledonite. Crystals were found in pockets encased in masses of galena. Raygrantite is a secondary mineral and is the result of pyrite-galena-chalcopyrite veins. In this district of the Rocky Mountains, intrusions can date back to the late Cretaceous period.

Physical properties Raygrantite is a colorless, transparent mineral that occurs in bladed crystal structures. This bladed structure has striations parallel to the C-axis. Its luster is vitreous, which means it looks similar to glass. Raygrantite on the Mohs hardness scale is a three, which is .5 softer than a penny. It exhibits brittle tenacity and has good cleavage along the {120} plain. This mineral also has characteristic fishtail twinning along the {121} in addition to a twin axis along the {010}. This mineral's recorded density is 6.374 g/cm3.

Optical properties Raygrantite is transparent with a vitreous luster. It is biaxial positive, which means it will refract light along two axes. The mineral's 2Vmeas. 76° (2) and 2Vcalc. 85°. The refractive indices are: nα= 1.915(7) nβ= 1.981(7) nγ= 2.068(9). Dispersion is strong, v < r. Raygrantite also exhibits absorption spectra of Z>Y>X.

Chemical structure Raygrantite is isotypic with iranite and hemihedrite. When looking at the chemical structure of the iranite mineral group, there are 10 symmetrically independent non-H cation sites. Of these sites, five are filled by lead Pb2þ (Pb1, Pb2, Pb3, Pb4, and Pb5). Then three are filled by S6þ (S1, S2, and S3). Finally, one of the sites is filled by Si4þ, and the last is filled by Zn2þ. Raygrantite is composed of layers of tetrahedron and octahedron joined by lead ions.

Chemical composition

X-ray crystallography To collect this data, a Bruker X8 APEX2 CCD X-ray diffractometer equipped with graphite-monochromatized MoKa radiation was used. Through these analyses, we can understand that Raygrantite is a member of the triclinic crystal system. It was also noted that the space group of this mineral is 1 – Pinacoidal. The next conclusion that can be drawn from the X-ray diffraction data is the unit cell dimensions. These are as such: a = 9.3175(4) Å, b = 11.1973(5) Å c = 10.08318(5) Å.

Worked examples

Example 1 — a first encounter with Raygrantite

Start with the simplest possible case. Write down what Raygrantite 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 Raygrantite 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 Raygrantite 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 Raygrantite

In research: Raygrantite 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 Raygrantite 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: Raygrantite is common in secondary-school and first-year university syllabi. It links to neighbouring topics Lead minerals, Minerals in space group 11, Natural materials, so understanding it makes those chapters shorter.
In everyday life: Look for Raygrantite 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 Raygrantite in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Raygrantite 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 Raygrantite out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Raygrantite in simple terms?

Raygrantite is a mineral first discovered in Big Horn Mountains, Maricopa County, Arizona, US. More specifically, it is located in the evening star mine, which is a Cu, V, Pb, Ag, Au, and W mine.

Why does Raygrantite 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 Raygrantite?

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 Raygrantite.