Bournonite and Quartz

ID	490
Mineral	Bournonite Quartz
Location	Huancavelica - Peru
Fluorescence	LW-UV: close SW-UV: close
Mindat.org	View Bournonite information at mindat.org View Quartz information at mindat.org

Mindat data

ID	741
Long ID	1:1:741:6
Formula	`CuPbSbS₃`
IMA Status	0 1
Other Occurrences	Moderate temperature hydrothermal veins.
Discovery Year	1805
Diapheny	Opaque
Cleavage	Imperfect on {010}, less perfect on {100}{001}
Tenacity	brittle
Colour	Steel-gray
Hardness (min)	2.5
Hardness (max)	3.0
About the name	Named in 1805 by Robert Jameson in honor of Jacques-Louis, Comte de Bournon [21 January 1751 - 24 August 1825], crystallographer and mineralogist. Count de Bournon left France after the French Revolution to England and did not return to France until the Bourbon Restoration in 1814. Count de Bournon was an active mineralogist and researched the composition of meteorites (as early as 1802), but his research in mineralogical classification is his best-known contribution and he authored several detailed mineral collection catalogs featuring his classifications. Count de Bournon was one of the founders of the Geological Society in 1807. Count de Bournon named fibrolite.
Streak	Steel-gray
Crystal System	Orthorhombic
Cleavage Type	Imperfect/Fair
Fracture type	Irregular/Uneven,Sub-Conchoidal
Morphology	Crystals usually short prismatic to tabular [001]. Crystals often form sub-parallel aggregates. Faces {hk0} striated [001], {h01} striated [010], {100} lustrous and striated [010], {010} usually smooth and lustrous.
Twinning	On {110} very common often repeated, forming cruciform or wheel-like aggregates ("cogwheels"). Twin gliding: x1 {110}, δ2 [110]. Usually exhibits polysynthetic twinning on {110}, in part due to deformation.
key_elements	0 1 2
shortcode_ima	Bnn
Group	Bournonite Group

ID	3337
Long ID	1:1:3337:0
Formula	`SiO₂`
IMA Status	0 1
Other Occurrences	Most of them...
Industrial	Ore for silicon, glassmaking, frequency standards, optical instruments, silica source for concrete setting, filtering agents as sand. A major component of sand.
Diapheny	Transparent,Translucent
Cleavage	The rhombohedral cleavage r{10_11} is most often seen, there are at least six others reported.
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 bergcrystal, 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. 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

Price: € 30

Dimensions: Not registered

Weight: Not registered

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Symbol	Element
Cu	Copper
O	Oxygen
Pb	Lead
S	Sulfur
Sb	Antimony
Si	Silicium

Bournonite and Quartz

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