pseudomalachites
plural of pseudomalachite

pseudomanganite
Synonym of pyrolusite.

pseudomatrix
A lithic fragment that has been deformed to become a traditional sandstone matrix.

pseudomineral
A pseudomorph of a mineral

pseudominerals
plural of pseudomineral

pseudomorphoses
plural of pseudomorphosis

pseudomorphosis
A change of substance without any change in appearance; the formation of a pseudomorph.

pseudophillipsite
A variety of phillipsite containing less silica.

pseudopotential
A simplified approximation of the effective potential of electrons in a complex system such as a crystal lattice

pseudopotentials
plural of pseudopotential

pseudorutile
A mineral form of ferric titanate.

pseudorutiles
plural of pseudorutile

pseudosinhalite
A monoclinic-prismatic colorless mineral containing aluminum, boron, hydrogen, magnesium, and oxygen.

pseudosymmetries
plural of pseudosymmetry

pseudosymmetry
Apparent symmetry of a crystal due to twinning

pseudotachylite
A dark, glassy rock generated by frictional heat within faults

pseudotachylites
plural of pseudotachylite

pseudotachylyte
Alternative form of pseudotachylite.

pseudotachylytes
plural of pseudotachylyte

pseudotopaz
A quartz that resembles topaz.

psittacinite
Synonym of mottramite.

ptilolite
Mordenite; once designated as a new mineral, it was discovered to be identical with mordenite.

ptilolites
plural of ptilolite

puglianite
A kind of coarse-grained rock found in lava from Mount Somma in Italy, and composed of automorphic augite, leucite, and anorthite.

purey
A marble, of the sort used in playing marbles, that is one solid color through and through.

pureys
plural of purey

purie
A marble of a single opaque color.

puries
plural of purie

pushcharovskite
A triclinic mineral containing arsenic, copper, hydrogen, and oxygen.

putnisite
A quartz-like mineral, purple in colour, naturally occurring brittle crystals smaller than 0.5 mm, with an orthorhombic crystalline matrix of SrCa₄Cr³⁺₈(CO₃)₈SO₄(OH)₁₆·23H₂O

putoranite
An isometric-hexoctahedral brass yellow mineral containing copper, iron, and sulfur.

putzite
An isometric-hextetrahedral iron black mineral containing copper, germanium, silver, and sulfur.

pycnite
A massive subcolumnar variety of topaz.

pycnites
plural of pycnite

pyreneite
A greyish-black garnet.

pyreneites
plural of pyreneite

pyritohedra
plural of pyritohedron

pyritohedron
An irregular dodecahedron, the faces of which are identical but irregular pentagons.
The shape of one of the crystal habits of pyrite.

pyritohedrons
plural of pyritohedron

pyritoid
pyritohedron

pyritoids
plural of pyritoid

pyroaurite
A trigonal-hexagonal scalenohedral mineral containing carbon, hydrogen, iron, magnesium, and oxygen.

pyrobelonite
An orthorhombic-dipyramidal dark red mineral containing hydrogen, lead, manganese, oxygen, and vanadium.

pyrochlore
A mineral whose composition is that of a mixed niobate mostly of sodium, calcium and cerium, (Na,Ca)₂Nb₂O₆(OH,F).

pyrochlores
plural of pyrochlore

pyrochroite
A trigonal-hexagonal scalenohedral mineral containing hydrogen, manganese, and oxygen.

pyrognostics
The characteristics of a substance, especially of a mineral or metal salt, that are revealed by heat, especially by the use of a blowpipe and a charcoal block.

pyrolite
A theoretical rock considered to be the best approximation of the composition of Earth's upper mantle, generally considered to be one part tholeiitic basalt and three parts dunite.

pyrolites
plural of pyrolite

pyrophane
A mineral which is opaque in its natural state, but is said to change its color and become transparent by heat.

pyrophanite
A trigonal-rhombohedral mineral containing manganese, oxygen, and titanium.

pyrostilpnite
A certain monoclinic form of pyrargyrite.

pyroxmangite
A triclinic-pinacoidal mineral containing iron, manganese, oxygen, and silicon.

pyrrhite
A form of pyrochlore

pyrrhoarsenite
A form of berzeliite containing some antimony

pyrrhoarsenites
plural of pyrrhoarsenite

pyrrhosiderite
A form of lepidocrocite

pyrrhotine
pyrrhotite

pyrrhotines
plural of pyrrhotine

qingheiite
A complex yellow or green mineral with vitreous lustre.

qingheiites
plural of qingheiite

qingsongite
A rare mineral first discovered in Tibet in 2009.

quadratite
A tetragonal-ditetragonal dipyramidal mineral containing arsenic, cadmium, lead, silver, and sulfur.

quadridavyne
A mineral found in volcanic ash.

quartzine
A fibrous form of silica similar to chalcedony.

quartzines
plural of quartzine

quartzing
The extraction of quartz from the earth, and moreover the subsequent extraction of gold from quartz.
The penetration of another rock or of earth by quartz.

quartzite
A metamorphic rock from sandstone, consisting of interlocking grains of quartz.

quartzites
plural of quartzite

quartzoid
A form of crystal resembling quartz, having two six-sided pyramids, base to base.

quartzoids
plural of quartzoid

quartzwacke
Alternative form of quartz-wacke.

quasimomenta
plural of quasimomentum

quasimomentum
crystal momentum

quasimomentums
plural of quasimomentum

quatrandorite
A grey monoclinic mineral containing silver, lead, sulfur, and antimony.

queitite
A monoclinic-sphenoidal mineral containing lead, oxygen, silicon, sulfur, and zinc.

queluzite
A metamorphic rock composed of spessartine garnet, tephroite, amphibole, pyroxene and mica.

quenselite
A monoclinic-sphenoidal pitch black mineral containing hydrogen, lead, manganese, and oxygen.

quetenite
botryogen

quetzalcoatlite
A blue mineral containing zinc, tellurium, and copper.

quicksand
Wet sand that appears firm but in which things readily sink, often found near rivers or coasts.
Anything that metaphorically pulls one down or buries one; a treacherous, risky danger

quincite
rose-coloured opal

quinzite
Alternative form of quincite.

quisqueite
A brittle, lustrous black hydrocarbon.

rabbittite
A monoclinic mineral containing calcium, carbon, hydrogen, magnesium, oxygen, and uranium.

rabejacite
An orthorhombic mineral containing calcium, hydrogen, oxygen, sulfur, and uranium.

rabot
A rubber used in polishing marble.

rabots
plural of rabot

radhakrishnaite
A tetragonal rose-brown mineral containing chlorine, lead, sulfur, and tellurium.

radiolarite
radiolarian ooze, or the sedimentary rock formed from it.

radiolarites
plural of radiolarite

radovanite
An orthorhombic-dipyramidal pistachio green mineral containing arsenic, copper, hydrogen, iron, and oxygen.

radtkeite
A monoclinic-prismatic mineral containing chlorine, iodine, mercury, and sulfur.

raguinite
An orthorhombic bronze mineral containing iron, sulfur, and thallium.

raite
An orthorhombic-disphenoidal mineral containing hydrogen, manganese, oxygen, silicon, and sodium.

rajite
A monoclinic-prismatic green mineral containing copper, oxygen, and tellurium.

ralphcannonite
A tetragonal black mineral containing silver, astatine, sulphur, zinc, and tellurium.

ralstonite
An isometric-hexoctahedral mineral containing aluminum, fluorine, hydrogen, magnesium, oxygen, and sodium.

ramazzoite
A polyoxometallate mineral containing copper, oxygen, carbon, hydrogen, magnesium, phosphorus and sulphur.

rambergite
A hexagonal-dihexagonal pyramidal mineral containing manganese and sulfur.

ramdohrite
A monoclinic-prismatic bluish black gray mineral containing antimony, lead, silver, and sulfur.

rameauite
A monoclinic orange mineral containing calcium, hydrogen, oxygen, potassium, and uranium.

rammelsbergite
A nickel arsenide mineral.

rammelsbergites
plural of rammelsbergite

ramsayite
Synonym of lorenzenite.

ramsbeckite
A monoclinic-prismatic green mineral containing copper, hydrogen, oxygen, sulfur, and zinc.

rankachite
An orthorhombic-dipyramidal mineral containing calcium, hydrogen, iron, oxygen, tungsten, and vanadium.

rankamaite
An orthorhombic-dipyramidal mineral containing aluminum, hydrogen, lead, lithium, niobium, oxygen, potassium, sodium, and tantalum.