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IGI provides independent grading reports, colored stone reports, identification and appraisal reports, diamond authentication and attestations of origin, and laser inscription services. They also offers diamond and colored stone courses through IGI's Schools of Gemology. [7] Graduates from the IGI school of Gemology are awarded an IGI Diploma.
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The following is a list of various types of marble according to location. (NB: Marble-like stone which is not true marble according to geologists is included, but is indicated by italics with geologic classification given as footnote.
This is a list of minerals which have Wikipedia articles. Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species .
A highly respected Islamic stone set in the Kaaba's corner. Blarney Stone: Blarney Castle, Blarney, Ireland: A stone that is part of the battlement of Blarney Castle. According to legend, kissing the stone endows the kisser with great eloquence/flattery. Blowing Stone: Kingston Lisle, Oxfordshire, England, United Kingdom: A sarsen. Boston Stone
The following is a list of rock types recognized by geologists. There is no agreed number of specific types of rock. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type. Additionally, different classification systems exist for each major type of rock. [1]
The name "iolite" comes from the Greek word for violet. Another old name is dichroite , a Greek word meaning "two-colored rock", a reference to cordierite's strong pleochroism . It has also been called "water-sapphire" and "Vikings' Compass" because of its usefulness in determining the direction of the sun on overcast days, the Vikings having ...
Pectolite is a white to gray mineral, Na Ca 2 Si 3 O 8 (OH), a sodium calcium hydroxide inosilicate.It crystallizes in the triclinic system typically occurring in radiated or fibrous crystalline masses.