FEATURE ARTICLES A QUANTITATIVE DESCRIPTION …
dum sample (again, see figure 1), though it is com-mon for natural corundum to contain more than one by a factor of approximately 500, meaning they range. color-causing agent, as all natural corundum gener-ally contains measureable levels of trace elements Mg, Si, Ti, V, Cr, Fe, and Ga that have been incorpo-rated into the lattice.
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Stratified Sampling | Definition, Guide & Examples
In stratified sampling, researchers divide subjects into subgroups called strata based on characteristics that they share.
Corundum C‐Axis Device for Sample Preparation
A precision tool for mechanically orienting and attaching a dop aligned to the c‐axis of corundum samples has successfully been developed and introduced at several GIA …
Concentrators Sample Collection -What, When, …
What is the purpose of SAMPLING? Where do you need to collect samples in a plant for good operation and correct metallurgical …
Corundum
Search RRUFF Sample Data Search Results. Sort By: Displaying: 1 - 22 22 Records Found NAMES RRUFF ID IDEAL CHEMISTRY SOURCE LOCALITY OPTIONS; Corundum: R040096: Al 2 O 3: University of Arizona Mineral Museum 11567: Sri Lanka: Corundum: X050042: Al 2 O 3: G.R. Rossman 1020b: Australia: Corundum: X050043: Al 2 O 3: …
Sampling Methods In Reseach: Types, Techniques,
Sampling methods in psychology refer to strategies used to select a subset of individuals (a sample) from a larger population, to study and draw inferences about the entire population. Common methods include random sampling, stratified sampling, cluster sampling, and convenience sampling. Proper sampling ensures representative, …
Intriguing minerals: corundum in the world of rubies and
This lecture text presents features of the fascinating mineral corundum and its gem varieties, ruby and sapphire. The geologic occurrences of its varieties and the best-known world localities are presented in detail. The mineralogy and crystallography of corundum, as well as its occurrence forms, are discussed. The origin of their colour …
Stratified Sampling | A Step-by-Step Guide with Examples
In stratified sampling, researchers divide subjects into subgroups called strata based on characteristics that they share.
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Based on bulk sampling done to date, the study assumes that rough gem and near-gem ruby and pink sapphire comprises 39% of the total clean rough corundum in the deposit …
The Inconvenient Truth About Convenience and Purposive Samples
Most research is conducted on convenience and purposive samples that may be randomly or nonrandomly drawn. A convenience sample is the one that is drawn from a ...
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4.6 Sampling procedures for concentrate stockpiles
In the absence of internationally or nationally accepted standard sampling procedures, the following sampling procedures for concentrate stockpiles may be used to determine …
4 Types of Random Sampling Techniques Explained | Built In
Collect unbiased data utilizing these four types of random sampling techniques: systematic, stratified, cluster, and simple random sampling.
Formation of corundum and associated mineral zones in the …
The genesis of corundum, in general, and poorly developed gem colored corundum, in particular, the absence of Al-silicate minerals, the process of formation and …
Sampling Methods: A guide for researchers
Sampling is a critical element of research design. Different methods can be used for sample selection to ensure that members of the study population reflect both the source and target populations, including probability and non-probability sampling.
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Corundum | NOVA Mineralogy
Corundum in Hand Sample. Corundum Hexagonal corundum Pinkish red corundum (ruby) with black hornblende in the epidote-family mineral zoisite. Corundum in Thin Section. Stay tuned! Further Reading. Corundum …
Sampling Methods | Types, Techniques, & Examples
Probability sampling methods include simple random sampling, systematic sampling, stratified sampling, and cluster sampling. What is non-probability sampling? In non-probability sampling, the sample is selected based on non-random criteria, and not every member of the population has a chance of being included.
Simple Random Sampling: Definition & Examples
In simple random sampling, researchers randomly choose subjects from a population with equal probability to create representative samples.
Corundum Mineral Data
General Corundum Information : Chemical Formula: Al2O3 : Composition: Molecular Weight = 101.96 gm Aluminum 52.93 % Al 100.00 % Al 2 O 3: Oxygen 47.07 % O: 100.00 % 100.00 % = TOTAL OXIDE
(PDF) Sampling Methods in Research: A Review
Sampling is one of the most important factors which determines the accuracy of a study. This article review the sampling techniques used in research including Probability sampling techniques, ...
Probability Sampling
Probability sampling is a method used to select a sample of individuals from a population in which the chance of selecting each individual...
Corundum dissolution in concentrated sodium …
Fig. 1: SEM photographs: (a) corundum; (b) incompletely dissolved corundum sodium hydroxide was analytical grade and purchased from the National Pharmaceutical Group, China.
Corundum with Spinel Corona from the Tan Huong–Truc …
Explains the reactions responsible for the formation of a well-developed reaction rim of spinel that surrounds the corundum core in some specimens from this deposit.
What Is Convenience Sampling? | Definition & Examples
Convenience sampling is a non-probability sampling method where units are selected for inclusion in the sample due to convenience.
Sampling Methods: Guide To All Types with …
Learn about sampling methods to draw statistical inferences from your population. Target the right respondents and collect insights.
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Simple Random Sampling | Definition, Steps & Examples
In simple random sampling, researchers collect data from a random subset of a population to draw conclusions about the whole population.
A Quantitative Description of the Causes of Color in Corundum
Presents a quantitative means of determining the causes of color in a gem material, using corundum's six major chromophores as an illustration.
Corundum X080007
Sample Description: Unoriented sample; 532 and 780 nm spectra are overwhelmed by fluorescence. DOWNLOADS: ... Karmakar S, Mukherjee S, Dutta U (2020) Origin of corundum within anorthite megacrysts from anorthositic amphibolites, Granulite Terrane, Southern India, American Mineralogist, 105, 1161-1174 ...