Arsenic

cinnabar

realgar

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Formula: As
Native element, forms a series with antimony
Specific gravity: 5.6 to 5.8
Hardness: 3½
Streak: Tin-white
Colour: Tin-white, tarnishing to dark grey or black
Solubility: On heating arsenic sublimes without melting
Common impurities: Bi,Sb,Fe,Ni,Ag,S,Se
Environments:

Hydrothermal environments

Arsenic occurs in hydrothermal veins and deposits that contain other arsenic minerals, sometimes in cobalt-silver sulphide veins. (HOM) It oxidises slowly in air and is then covered with a thin crust of tiny arsenolite crystals (Mindat). Associated minerals include arsenolite, cinnabar, realgar, orpiment, stibnite, galena, sphalerite, pyrite and baryte. (HOM)

At Llallagua, Bolivia, arsenic has been identified in a specimen consisting of alternating lamellae of native arsenic, realgar and gypsum, probably formed by the oxidation of arsenopyrite. (MinRec 37.2.126)

Arsenic-bearing minerals include:

Alloys
stibarsen
viteite

Sulphides
arsenopyrite
cobaltite
duranusite
glaucodot
hollingworthite
lautite
pääkkönenite
paradimorphite
realgar
wakabayashilite

Arsenides
algodonite
arsenopalladinite
atheneite
cherepanovite
clinosafflorite
domeykite
isomertieite
koutekite
krutovite
kutinaite
majakite
nickeline
nickelskutterudite
novákite
omeiite
orcelite
palladodymite
paxite
rammelsbergite
rhodarsenide
safflorite
skutterudite
sperrylite

Sulphosalts
Sulphosalt minerals are complex sulphide minerals with the general formula AmBnSp, where A represents a metal, B usually represents a semi-metal such as arsenic, and S is sulphur or rarely selenium or/and tellurium (Wiki).

aktashite
baumhauerite
bernardite
boscardinite
chabournéite
chaméanite
dufrénoysite
enargite
ferrofettelite
geocronite
guettardite
hatchite
hutchinsonite
jordanite
kirkiite
laffittite
lengenbachite
liveingite
lorándite
luboržákite
luzonite
madocite
pearceite
playfairite
polybasite
proustite
quadratite
rathite
routhierite
sartorite
seligmannite
smithite
sorbyite
stalderite
sterryite
tennantite
tennantite-(Hg)
tsugaruite
twinnite
wallisite
xanthoconite
zvestovite-(Zn)

Selenides
kalungaite

Oxides
arsenolite
claudetite
garpenbergite
karibibite

Carbonates
claraite

Arsenates
adamite
adelite
aerugite
agardite
aldomarinoite
allactite
annabergite
armellinoite-(Ce)
arsendescloizite
arseniosiderite
arsenoclasite
arsenocrandallite
arsenowagnerite
arsentsumebite
arsenuranylite
arthurite
asselbornite
atelestite
austinite
bariopharmacosiderite
bayldonite
bergslagite
berzeliite
beudantite
bradaczekite
brandtite
brassite
bulachite
cahnite
carminite
caryinite
chalcophyllite
chenevixite
chernovite-(Y)
chlorophoenicite
chudobaite
chursinite
claraite
clinoclase
cobaltarthurite
cobaltaustinite
cobaltkoritnigite
cobaltlotharmeyerite
cobalttsumcorite
conichalcite
cornubite
cornwallite
dobšináite
duftite
dussertite
erythrite
euchroite
eveite
fahleite
feinglosite
ferrarisite
ferrilotharmeyerite
flinkite
fluckite
fornacite
gaitite
gallobeudantite
gartrellite
gasparite-(Ce)
geminite
gerdtremmelite
goldhillite
goudeyite
graulichite-(Ce)
grischunite
haidingerite
hallimondite
hedyphane
helmutwinklerite
hematolite
hidalgoite
holdenite
hornesite
ianbruceite
irhtemite
jarosewichite
jeankempite
johillerite
johnbaumite
keyite
kolicite
koritnigite
köttigite
kraisslite
lammerite
lavendulan
legrandite
lemanskiite
lindackerite
liroconite
lombardoite
luetheite
lukrahnite
mahnertite
manganberzeliite
mansfieldite
mawbyite
metaköttigite
metanováčekite
metauranospinite
metazeunerite
mimetite
mixite
molybdofornacite
monteneroite
nickenichite
nováčekite
o'danielite
ojuelaite
olivenite
paraberzeliite
parabrandtite
paradamite
parasymplesite
parnauite
pharmacoalumite
pharmacolite
pharmacosiderite
phaunouxite
philipsbornite
philipsburgite
picropharmacolite
pitticite
preisingerite
prosperite
pushcharovskite
rauenthalite
retzian
richelsdorfite
rooseveltite
roselite
roselite-β
rösslerite
sainfeldite
sarkinite
scorodite
segnitite
smolyaninovite
sterlinghillite
stranskiite
strashimirite
svabite
symplesite
synadelphite
talmessite
tetrarooseveltite
thometzekite
thorasphite
tilasite
trögerite
tsumcorite
tyrolite
uranospinite
urusovite
wallkilldellite
walpurgite
warikahnite
weilerite
weilite
wendwilsonite
yanomamite
yukonite
yurgensonite
yvonite
zálesíite
zincgartrellite
zincolivenite
zincroselite

Antimonates
manganostibite

Arsenites
asbecasite
cafarsite
dixenite
finnemanite
gebhardite
leiteite
ludlockite
magnussonite
reinerite
rouseite
schneiderhöhnite
trigonite

Molybdates
betpakdalite

Nesosilicates
arrheniusite-(Ce)
vicanite-(Ce)

Sorosilicates
tiragalloite

Phyllosilicates
nelenite

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