Kyanite, Quartz and Lepidolite
| ID | 631 | |
|---|---|---|
| Mineral |
Kyanite
Quartz Lepidolite |
|
| Location | Barra do Salinas - Minas Gerais - Brazil | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Kyanite information at mindat.org View Quartz information at mindat.org View Lepidolite information at mindat.org |
|
Mindat data
| ID | 2303 |
|---|---|
| Long ID | 1:1:2303:6 |
| Formula |
Al2OSiO4
|
| IMA Status |
APPROVED GRANDFATHERED |
| Description | Common metamorphic silicate mineral. The generally bluish colour is caused by Fe(II)-Fe(III) charge transfer (Faye and Nickel, 1969). |
| Occurrence | In medium to high pressure and low to medium temperature metamorphic rocks. |
| Other Occurrences | Metamorphic rocks of moderately high-pressure regional metamorphism. |
| Industrial | Ceramics |
| Diapheny | Transparent,Translucent |
| Cleavage | Perfect on (100), good on (010) |
| Tenacity | brittle |
| Colour | Blue, white, light gray, green, rarely yellow, orange, pink |
| Hardness (min) | 5.5 |
| Hardness (max) | 7.0 |
| Lustre | Vitreous |
| About the name | Named in 1789 by Abraham Gottlob Werner from the Greek word "kyanos", meaning "blue," the common colour of the species. The French spelling, "Cyanite", was commonly used by mineralogists through much of the 19th and early 20th centuries. |
| Streak | Colorless |
| Crystal System | Triclinic |
| Cleavage Type | Perfect |
| Fracture type | Splintery |
| Morphology | Crystals bladed or tabular. |
| Twinning | Lamellar on (100), common |
| UV | Not usually fluorescent. Weak pink-red fluorescence under longwave reported at Thomaston Dam, Connecticut (Don Swenson, pers. com., 2017). Robbins (1994) indicated that some kyanite fluoresces: "From Pfitsch in the Tyrol, Austria, colorless blades of kyan |
| Comment Luster | Somewhat pearly on {100} || to the perfect cleavage |
| shortcode_ima | Ky |
| ID | 3337 |
|---|---|
| Long ID | 1:1:3337:0 |
| Formula |
SiO2
|
| IMA Status |
APPROVED GRANDFATHERED |
| Description | Quartz is one of the most common minerals found in the Earth's crust. If pure, quartz forms colourless, transparent and very hard crystals with a glass-like lustre. A significant component of many igneous, metamorphic and sedimentary rocks, this natura... |
| Other Occurrences | Most of them... |
| Industrial | Ore for silicon, glassmaking, frequency standards, optical instruments, silica source for concrete setting, filtering agents as sand, fracing sand used in oil production. A major component of sand. High purity quartz is used as an ore for creating sili |
| Diapheny | Transparent,Translucent |
| Cleavage |
The rhombohedral cleavage r |
| Tenacity | brittle |
| Colour | Colorless, purple, rose, red, black, yellow, brown, green, blue, orange, etc. |
| Hardness (min) | 7.0 |
| Hardness (max) | 7.0 |
| Luminescence | Triboluminescent |
| Lustre | Vitreous |
| About the name | Quartz has been known and appreciated since pre-historic times. The most ancient name known is recorded by Theophrastus in about 300-325 BCE, κρύσταλλος or kristallos. The varietal names, rock crystal and Bergkristall (German), preserve the ancient usage. The root words κρύοσ signifying ice-cold and στέλλειυ to contract (or solidify) suggest the ancient belief that kristallos was permanently solidified ice. The earliest printed use of "querz" was anonymously published in 1505, but attributed to a physician in Freiberg, Germany, Ulrich Rülein von Kalbe (a.k.a. Rülein von Calw, 1527). Agricola used the spelling "quarzum" (Agricola, 1530) as well as "querze", but Agricola also referred to "crystallum", "silicum", "silex", and silice". Tomkeieff (1941) suggested an etymology for quartz: "The Saxon miners called large veins - Gänge, and the small cross veins or stringers - Querklüfte. The name ore (Erz, Ertz) was applied to the metallic minerals, the gangue or to the vein material as a whole. In the Erzgebirge, silver ore is frequently found in small cross veins composed of silica. It may be that this ore was called by the Saxon miners 'Querkluftertz' or the cross-vein-ore. Such a clumsy word as 'Querkluftertz' could easily be condensed to 'Querertz' and then to 'Quertz', and eventually become 'Quarz' in German, 'quarzum' in Latin and 'quartz' in English." Tomkeieff (1941, q.v.) noted that "quarz", in its various spellings, was not used by other noted contemporary authors. "Quarz" was used in later literature referring to the Saxony mining district, but seldom elsewhere. Gradually, there were more references to quartz: E. Brown in 1685 and Johan Gottschalk Wallerius in 1747. In 1669, Nicolaus Steno (Niels Steensen) obliquely formulated the concept of the constancy of interfacial angles in the caption of an illustration of quartz crystals. He referred to them as "cristallus" and "crystallus montium". Tomkeieff (1941) also noted that Erasmus Bartholinus (1669) used the various spellings for "crystal" to signify other species than quartz and that crystal could refer to other "angulata corpora" (bodies with angles): "In any case in the second half of the XVIIIth century quartz became established as a name of a particular mineral and the name crystal became a generic term synonymous with the old term 'corpus angulatum'." |
| Streak | White |
| Crystal System | Trigonal |
| Cleavage Type | Poor/Indistinct |
| Fracture type | Conchoidal |
| Twinning | Dauphiné law. [[1]] Brazil law. Japan law. Others for beta-quartz... |
| Thermal Behaviour | Transforms to beta-quartz at 573° C and 1 bar (100 kPa) pressure. |
| shortcode_ima | Qz |
| ID | 2380 |
|---|---|
| Long ID | 1:1:2380:7 |
| Entry type | 5 |
| Diapheny | Transparent,Translucent |
| About the name | Named in 1792 by Martin Klaproth from the Greek words lepidos for "scale" and lithos for "stone". |
| Fracture type | Micaceous |
| shortcode_ima | Lpd |
Details
Price: € 140
Dimensions: Not registered
Weight: Not registered
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| Al | Aluminium | |
| O | Oxygen | |
| Si | Silicium |