Global Information Lookup Global Information

Crocoite information


Crocoite
Crocoite from Dundas, Tasmania
General
CategoryChromate minerals
Formula
(repeating unit)		Lead Chromate PbCrO4
IMA symbolCrc[1]
Strunz classification7.FA.20
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/n
Unit cella = 7.12 Å, b = 7.421 Å,
c = 6.8 Å; β = 102.41°; Z = 4
Identification
ColorOrange, red, yellow; orange-red in transmitted light.
Crystal habitCoarsely crystalline to acicular
CleavageDistinct on {110} indistinct on {001} and {100}
FractureConchoidal to uneven
TenacitySectile
Mohs scale hardness2.5–3
LusterAdamantine, Sub-Adamantine, Sub-Vitreous, Resinous, Waxy
StreakYellowish orange
DiaphaneityTransparent to translucent
Specific gravity5.9–6.1
Optical propertiesBiaxial (+)
Refractive indexnα = 2.290(2) nβ = 2.360(2) nγ = 2.660(2)
Birefringenceδ = 0.370
PleochroismWeak
References[2][3][4]

Crocoite is a mineral consisting of lead chromate, PbCrO4, and crystallizing in the monoclinic crystal system. It is identical in composition with the artificial product chrome yellow used as a paint pigment.[5]

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ "Crocoite (PbCrO4)" (PDF). Rruff.geo.arizona.edu. Retrieved 19 December 2016.
  3. ^ "Crocoite: Crocoite mineral information and data". Mindat.org. 15 December 2016. Retrieved 19 December 2016.
  4. ^ "Crocoite Mineral Data". Webmineral.com. Retrieved 19 December 2016.
  5. ^ Chisholm 1911.

and 24 Related for: Crocoite information

Request time (Page generated in 0.5561 seconds.)

Crocoite

Last Update:

Crocoite is a mineral consisting of lead chromate, PbCrO4, and crystallizing in the monoclinic crystal system. It is identical in composition with the...

Word Count : 754

Chromium

Last Update:

Louis Nicolas Vauquelin received samples of crocoite ore. He produced chromium trioxide (CrO3) by mixing crocoite with hydrochloric acid. In 1797, Vauquelin...

Word Count : 11258

Tasmania

Last Update:

Leatherwood (unofficial) (Eucryphia lucida) Colour(s) Bottle Green (PMS 342), Yellow (PMS 114), & Maroon (PMS 194) Mineral Crocoite (PbCrO4) Website tas.gov.au...

Word Count : 15461

Chromate and dichromate

Last Update:

obtained directly from the liquor. Chromate containing minerals are rare. Crocoite, PbCrO4, which can occur as spectacular long red crystals, is the most...

Word Count : 1229

List of gemstones by species

Last Update:

Sapphire (var.) Padparadscha Golden sheen sapphire Covellite Creedite Crocoite Cryolite Cuprite Danburite Datolite Descloizite Diamond Bort Ballas Diaspore...

Word Count : 866

Group 6 element

Last Update:

mineral was crocoite with a formula of PbCrO4. Studying the mineral in 1797, Louis Nicolas Vauquelin produced chromium trioxide by mixing crocoite with hydrochloric...

Word Count : 1947

List of minerals

Last Update:

Cornwallite Corundum Cotunnite Covellite Coyoteite Creedite Cristobalite Crocoite Cronstedtite Crookesite Crossite (not approved by IMA) Cryolite Cryptomelane...

Word Count : 2732

Monazite

Last Update:

S.; de Pieri, R. "A three-dimensional refinement of the structure of crocoite, PbCrO4" Acta Crystallographica 1965, volume 19, pp. 287–289. Clavier,...

Word Count : 1970

Yellow

Last Update:

pigments. Chrome yellow (lead chromate, PbCrO 4), derived from the mineral crocoite, was used by artists in the earlier part of the 19th century, but has been...

Word Count : 10804

Discovery of chemical elements

Last Update:

1797 N. Vauquelin 1798 N. Vauquelin Vauquelin analysed the composition of crocoite ore in 1797, and later isolated the metal by heating the oxide in a charcoal...

Word Count : 4821

List of inorganic pigments

Last Update:

occurs as the mineral greenockite. Chromium pigments Chrome yellow or crocoite (PY34): lead chromate (PbCrO4). Cobalt pigments Aureolin or cobalt yellow...

Word Count : 866

Chromite

Last Update:

generally produced through human activity and rarely seen in nature (as in crocoite), and is a highly toxic carcinogen that may kill animals and humans if...

Word Count : 3017

Cantonnier Lode

Last Update:

pyromorphite and crocoite. To the north follows a 10 centimeter wide band of white, powdery mylonite very rich in pyromorphite and crocoite. Next comes a...

Word Count : 1114

Geology of Tasmania

Last Update:

rumbling in the distance. Several unusual minerals are known from Tasmania: crocoite, stichtite, ferroaxinite from Dundas, sellaite, chondrodite, norbergite...

Word Count : 11155

Louis Nicolas Vauquelin

Last Update:

gastronomy, and the mineral vauquelinite, discovered at the same mine as the crocoite from which Vauquelin isolated chromium. Biographical Index of Former Fellows...

Word Count : 828

List of symbols of states and territories of Australia

Last Update:

fidelitas Fertility and Faithfulness Bottle green, yellow and maroon     Crocoite - Tasmanian tartan Symbols of Tasmania Victoria Coat of arms of Victoria...

Word Count : 320

Beryozovskoye deposit

Last Update:

cassedanneite (1988), crocoite (1766), pyrophyllite (1829), phenicochroite (1839), embreyite (1972). The discovery of crocoite by Johann Gottlob Lehmann...

Word Count : 215

Mimetite

Last Update:

formerly applied to a chromium-bearing mimetite, or possibly a mixture of crocoite, mimetite and quartz, which forms attractive orange red crystals, but has...

Word Count : 480

Hexavalent chromium

Last Update:

Hexavalent chromium occurs only rarely in nature, an exception being crocoite (PbCrO4). It is however produced on a large scale industrially. Virtually...

Word Count : 7079

Chrome yellow

Last Update:

French chemist Louis Nicolas Vauquelin. Vauquelin was studying the mineral crocoite, a natural form of lead chromate, when he identified the presence of a...

Word Count : 1107

Dundasite

Last Update:

occurring in the oxidized zone of lead ore deposits. It commonly overgrows crocoite. It may also be overgrown by yellow cerussite. It may be associated with...

Word Count : 210

List of mineral symbols

Last Update:

Calamaite Clm Cassagnaite Csg Chestermanite Csm Clinojimthompsonite Cjim Crocoite Crc Calaverite Clv Cassedanneite Cda Chevkinite-(Ce) Cvk-Ce Clinokurchatovite...

Word Count : 401

Symbols of Tasmania

Last Update:

Crocoite...

Word Count : 101

Zeehan

Last Update:

Centre features examples of Tasmania's mineral emblem, the valuable crystal crocoite, as well as other geological specimens and historic mining artefacts. The...

Word Count : 2310
PDF Search Engine © AllGlobal.net