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Most blue spots and especially crystals are linarite. However, unimpressive blue splotches of azurite associated with malachite (affirming carbonate composition) have turned up over the years. Steve Adams

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Original EntryMost blue spots and especially crystals are linarite. However, unimpressive blue splotches of azurite associated with malachite (affirming carbonate composition) have turned up over the years. Steve Adams
Mindat Ref. ID16081711Long-form Identifiermindat:1:5:16081711:5
GUID0
Full ReferenceMost blue spots and especially crystals are linarite. However, unimpressive blue splotches of azurite associated with malachite (affirming carbonate composition) have turned up over the years. Steve Adams
Plain TextMost blue spots and especially crystals are linarite. However, unimpressive blue splotches of azurite associated with malachite (affirming carbonate composition) have turned up over the years. Steve Adams

Map of Localities

Mineral Occurrences

LocalityMineral(s)
Silver Hill Mine, Silver Hill, Silver Hill Mining District, Carolina Slate Belt, Davidson County, North Carolina, USAⓘ Azurite

See Also

These are possibly similar items as determined by title/reference text matching only.

Small beige to white bladed crystals of barite associated with small quartz crystals have been found in the past but very rare. One that I found decades ago now in the Kenny Gay collection. Steve Adams
Hajdu, Steve (2011) The old spots are sometimes the best spots. https://www.mindat.org/article.php/1122/The+old+spots+are+sometimes+the+best+spots.
Vernet, R. (1996) Trucs, Astuces du Géologue et du Minéralogiste de Terrain: Distinction entre Azurite et Linarite par microchimie [Tips and Tricks for the Field Geologist and Mineralogist: Distinguishing Azurite from Linarite by Microchemistry]. Le Règne Minéral, 2 (9). 42
Gunter, Richard (2023) Richard Gunter Catalogue Azurite, Malachite B.C. https://www.mindat.org/article.php/4598/Richard+Gunter+Catalogue+Azurite%2C+Malachite+B.C.
Some stibnite was finally found as inclusions in blue baryte crystals (EDS analysed). All the free stibnite crystals have disappeared, and only the included ones have been protected from the dissolution phase.
Amstutz, G. C. (1981) Malachit nach Azurite [Malachite after azurite]. Lapis, 6 (11) 22
Personally collected and analyzed by David Lowe. White opaque crystals associated with brown Andradite and greenish-blue Clinochlore on Serpentine matrix.
Moore, Samuel K. (2023) A Dark (Blue) Horse Emerges to Speed Up Computing: Avicena's blue microLEDs are in a race with Ayar Lab's laser-based system. IEEE Spectrum, 60 (1) 30-31 doi:10.1109/mspec.2023.10006658
I used to do some business in this town and have bought many polished quartz crystals from this area with beautiful inclusions of one kind or another. Most of these have been over polished to better display the inclusions. [Rock Currier 2011]
Ruszala, F., Kostiner, E. (1974) The hydrothermal synthesis of single crystals of azurite and malachite. Journal of Crystal Growth, 26 (1). 155-156 doi:10.1016/0022-0248(74)90219-x
Most samples are thin veins of short needles in Calcite and have no color.
 
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