soucekite
An orthorhombic-pyramidal lead gray mineral containing bismuth, copper, lead, selenium, and sulfur.

souesite
Synonym of awaruite.

soumansite
Synonym of wardite.

souzalite
A triclinic mineral containing aluminum, hydrogen, iron, magnesium, oxygen, and phosphorus.

sovite
A coarse-grained carbonatite.

sovites
plural of sovite

spaad
A kind of spar; earthflax, or amianthus.

spadaite
An orthorhombic mineral containing hydrogen, magnesium, oxygen, and silicon.

spandite
A combination of spessartine and andradite. Ca-Fe-rich spessartine or Mn-Al-rich andradite.

spandites
plural of spandite

spangite
a supposed mineral, now believed to be phillipsite.

sparklies
Things that sparkle; gems.
A kind of interference pattern on analogue satellite television, caused by a signal that is either too weak or too strong.

spectrolite
a rare variety of labradorite feldspar, ranging in colors from blue to red.

spectrolites
plural of spectrolite

specularite
A form of hematite that contains specular, silvery crystals

specularites
plural of specularite

speiskobalt
Synonym of smaltite.

speleogen
A geological feature within a karst system that is created by the dissolution of bedrock.

speleothem
Any secondary mineral, deposited in a natural cave by the action of water. Includes formations such as stalactites, stalagmites, flowstones, and helictites.

speleothems
plural of speleothem

speleotherm
Alternative form of speleothem.

speleotherms
plural of speleotherm

spencerite
A monoclinic-prismatic white mineral containing hydrogen, oxygen, phosphorus, and zinc.

sperrylite
An isometric-diploidal tin white mineral containing arsenic and platinum.

sperrylites
plural of sperrylite

spertiniite
An orthorhombic-pyramidal mineral containing copper, hydrogen, and oxygen.

spetchell
An artificial chalk hill, typically formed through the dumping of chalk-rich industrial waste, which creates a sort of artificial limestone grassland.

spetchells
plural of spetchell

sphaerite
Alternative form of spherite.

sphaerobertrandite
A monoclinic-sphenoidal mineral containing beryllium, hydrogen, oxygen, and silicon.

sphaerobismoite
A tetragonal mineral containing bismuth and oxygen.

sphaerocrystal
Alternative form of spherocrystal.

sphaerocrystals
plural of sphaerocrystal

sphaerosiderite
Alternative form of spherosiderite.

sphaerosiderites
plural of sphaerosiderite

sphene
titanite

sphenes
plural of sphene

spheniscidite
A monoclinic-prismatic brown mineral containing aluminum, hydrogen, iron, nitrogen, oxygen, phosphorus, and potassium.

sphenolith
A wedge-shaped mass of igneous rock that intrudes into surrounding layers.

spherite
Any of a group of spherical mineral concretions commonly found in many invertebrates.
A spherical grain, typically of ovulite.

spherites
plural of spherite

spherobertrandite
Alternative form of sphaerobertrandite.

spherocrystal
Synonym of spherite.

spherocrystals
plural of spherocrystal

spherosiderite
A spheroidal variety of siderite.

spherosiderites
plural of spherosiderite

sphragide
An aluminous earth of a grayish yellow color; a medicinal clay.

sphragides
plural of sphragide
plural of sphragis

spilite
a very fine-grained igneous rock, resembling an altered basalt, containing feldspar together with chlorite, calcite, and epidote etc.

spilites
plural of spilite

spilitization
albitization of a basalt into spilite

spilitizations
plural of spilitization

spilosite
A greenish schistose rock spotted with chlorite.

spilosites
plural of spilosite

spinellite
A coarse-grained hypidiomorphic-granular titaniferous magnetite-rich igneous rock that has some spinel

spinellites
plural of spinellite

spionkopite
A trigonal-ditrigonal pyramidal mineral containing copper and sulfur.

spiroffite
A monoclinic-prismatic mineral containing manganese, oxygen, tellurium, and zinc.

spodiosite
An orthorhombic-dipyramidal mineral containing calcium, fluorine, oxygen, and phosphorus.

spodiosites
plural of spodiosite

spriggite
A monoclinic-prismatic bright orange mineral containing barium, calcium, hydrogen, lead, oxygen, and uranium.

springcreekite
A trigonal-hexagonal scalenohedral black mineral containing barium, hydrogen, oxygen, phosphorus, and vanadium.

srebrodolskite
An orthorhombic-dipyramidal mineral containing calcium, iron, and oxygen.

srilankite
An orthorhombic-dipyramidal black mineral containing oxygen, titanium, and zirconium.

staffelite
Synonym of lewistonite.

stalderite
A tetragonal-scalenohedral mineral containing arsenic, copper, iron, mercury, sulfur, thallium, and zinc.

stanekite
A monoclinic-prismatic black mineral containing iron, magnesium, manganese, oxygen, and phosphorus.

stanfieldite
A monoclinic-prismatic mineral containing calcium, iron, magnesium, manganese, oxygen, and phosphorus.

stanleyite
An orthorhombic mineral containing hydrogen, oxygen, sulfur, and vanadium.

stannine
The mineral stannite.

stannoidite
An orthorhombic-disphenoidal brass brown mineral containing copper, iron, sulfur, and tin.

stannomicrolite
An isometric-hexoctahedral yellow brown mineral containing hydrogen, iron, manganese, niobium, oxygen, tantalum, tin, and titanium.
A variety of the generalized microlite subgroup.

stannopalladinite
A hexagonal-dihexagonal dipyramidal mineral containing copper, palladium, and tin.

starkeyite
A monoclinic-prismatic white mineral containing hydrogen, magnesium, oxygen, and sulfur.

starstone
A gemstone that exhibits asterism.

starstones
plural of starstone

stassfurtite
A fibrous variety of boracite.

statuette
A small statue, usually a figure much less than life size, especially when of marble or bronze, or of plaster or clay as a preparation for the marble or bronze, as distinguished from a figure in terra cotta etc.

statuettes
plural of statuette

staurobaryte
Harmotome.

staurotide
staurolite

staurotides
plural of staurotide

steacyite
A tetragonal-ditetragonal dipyramidal mineral containing calcium, manganese, oxygen, potassium, silicon, sodium, and thorium.

steatite
Soapstone. (often synonymous; more information at soapstone § Terminology).

steatites
plural of steatite

steenstrupine
A rare dark brown mineral, (La,Ca,Na)(Al,Fe,Mn)(Si,P)(O,OH,F)₄, found in Greenland, occurring in rhombohedral crystals or massive formations.

steigerite
A monoclinic mineral containing aluminum, hydrogen, oxygen, and vanadium.

steinkern
A fossil formed from sediment that filled a hollow structure such as a shell.

steklite
An anthropogenic substance and trigonal mineral with formula KAl(SO₄)₂

stelznerite
Synonym of antlerite.

stenhuggarite
A tetragonal-pyramidal bright reddish orange mineral containing antimony, arsenic, calcium, iron, and oxygen.

stenonite
A monoclinic-prismatic mineral containing aluminum, barium, carbon, fluorine, oxygen, sodium, and strontium.

stepanovite
A trigonal mineral containing carbon, hydrogen, iron, magnesium, oxygen, and sodium.

stercorite
A triclinic-pinacoidal mineral containing hydrogen, nitrogen, oxygen, phosphorus, and sodium.

sterlinghillite
A monoclinic mineral containing arsenic, hydrogen, manganese, and oxygen.

sternbergite
An orthorhombic-dipyramidal light brown mineral containing iron, silver, and sulfur.

sterrettite
Synonym of kolbeckite.

sterryite
An orthorhombic-dipyramidal black mineral containing antimony, arsenic, lead, silver, and sulfur.

stetefeldtite
An isometric-hexoctahedral mineral containing antimony, hydrogen, oxygen, and silver.

stevensite
A monoclinic mineral containing calcium, hydrogen, iron, magnesium, oxygen, silicon, and sodium.

stewartite
A triclinic-pinacoidal mineral containing hydrogen, iron, manganese, oxygen, and phosphorus.

stibarsen
A trigonal-hexagonal scalenohedral mineral containing antimony and arsenic.

stibiconite
An isometric-hexoctahedral mineral containing antimony, hydrogen, and oxygen.