Goethite and Vanadinite

ID	164
Mineral	Goethite Vanadinite
Location	Taouz - Draa-Tafilalet - Morocco
Fluorescence	LW-UV: close SW-UV: close
Mindat.org	View Goethite information at mindat.org View Vanadinite information at mindat.org

ID	1719
Long ID	1:1:1719:6
Formula	`FeO(OH)`
IMA Status	0 1
Other Occurrences	Common weathering product, primary hydrothermal mineral, bog and marine environments.
Industrial	Iron ore
Discovery Year	1806
Diapheny	Opaque
Cleavage	{010}; {100} less perfect.
Tenacity	brittle
Colour	Brownish black, yellow-brown, reddish brown
Hardness (min)	5.0
Hardness (max)	5.5
About the name	Named in 1806 by Johann Georg Lenz in honor of the German poet, novelist, playwrighter, philosopher, politician, and geoscientist Johann Wolfgang von Goethe [August 28, 1749, Frankfurt, Germany – March 22, 1832, Weimar, Germany]. Goethe was Chief Minister of State of Weimar. (Portions of the Goethe mineral collection are reputedly held by the Goethe Society in New York, New York, USA.)
Streak	Yellowish brown, orange-yellow, ocher-yellow
Crystal System	Orthorhombic
Cleavage Type	Perfect
Fracture type	Irregular/Uneven
Morphology	Prismatic [001] and striated [001]; also flattened into tablets or scales on {010}. Velvety aggregates of capillary crystals to acicular [001] and long prismatic forms often radially grouped. Massive, reniform, botryoidal, stalactitic. Bladed or columnar. Compact or fibrous concretionary nodules. Oolitic.
Twinning	Apparently none reported, but see https://www.mindat.org/mesg-631125.html and compare twinning in isostructural diaspore.
Thermal Behaviour	Heated in a closed tube, gives off water.
shortcode_ima	Gth
Group	Diaspore Group

ID	4139
Long ID	1:1:4139:9
Formula	`Pb₅(VO₄)₃Cl`
IMA Status	0 1
Other Occurrences	A secondary mineral in the oxidized zone of lead bearing deposits.
Discovery Year	1838
Diapheny	Translucent
Tenacity	brittle
Colour	Orange-red, red-brown, brown, bright red, yellow, whitish; pale straw-yellow; colourless or weakly tinted in transmitted light.
Hardness (min)	2.5
Hardness (max)	3.0
Lustre	Sub-resinous to sub-adamantine
About the name	The name reflects its vanadium content.
Streak	White to pale yellow and light brownish yellow
Crystal System	Hexagonal
Cleavage Type	None Observed
Fracture type	Irregular/Uneven
Morphology	Well developed hexagonal prisms [0001]; the prisms range from tabular to acanthine, and may be terminated by pinacoids or less commonly hexagonal bipyramids. Usually with smooth faces and sharp edges; sometimes cavernous, also acicular, hairlike, fibrous, rounded, globular, skeletalized. Crystals may exhibit concentric zones of varying composition.
Thermal Behaviour	Heated in a closed tube, decrepitates and gives a faint white sublimate. Before the blowpipe fuses easily.
key_elements	0 1 2
shortcode_ima	Vna
Group	Apatite Group

Price: € 35

Dimensions: Not registered

Weight: 57 g

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