You Searched For: Rock Collections
28 results were found
Sodalite
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Sodalite Na8 Al6 Si6 O24 Cl2 Crystallography:
Isometric; 43m. Crystals rare, usually dodecahedrons. More commonly massive, granular.
Physical Properties: Cleavage: {011} poor. Fracture conchoidal to uneven; br...
Tuff
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Tuff Type:
Igneous; extrusive (pyroclastic). Texture/Appearance:
Clastic texture with angular rock and mineral fragments and lapilli mixed with fine-grained volcanic ash, partly cemented by sedimentary materia...
Arkose
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Arkose Type:
Sedimentary; clastic. Texture/Appearance:
Usually coarse-grained, sometimes with pebbles. Angular to subangular, poorly to moderately well-sorted sand grains. No Fossils.
Color: Gray, pink or redd...
Greenstone
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Greenstone Type:
Metamorphic; regional. Texture/Appearance:
Fine-grained, massive or compact; generally non-schistose. Color:
Dark, green. Mineralogy/Chemistry:
Mainly composed of chlorite, actinolite, epidote...
Nepheline
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Nepheline (Na,K) AlSiO4 Crystallography:
Hexagonal; 6. Rarely in small prismatic crystals with base; more commonly massive, compact, and in embedded grains.
Physical Properties: Cleavage: {1010} distinct. Frac...
Amphibolite
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Amphibolite Type:
Metamorphic; regional. Texture/Appearance:
Massive to foliated; gneissic to schistose. Color:
Black to dark-green often speckled with white. Mineralogy/Chemistry:
Mafic; composed primarily of...
Dolostone
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Dolostone Type:
Sedimentary, chemical. Texture/Appearance:
Fine to coarsely crystalline grain size; sugary (saccharoidal). May contain various fossil relicts, molds, and casts. Stratification absent or irregular.
Color: Li...
Opal
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Opal SiO2 • nH2O Crystallography:
None, amorphous. Massive, often in rounded and botryoidal forms, sometimes pisolitic. Physical Properties:
Cleavage: None; conchoidal fracture. Hardness: 5.0-6.0. Specific Gravity: 2.0-2.2...
Element of Month Lithum Boreal v2
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1
All About Elements: Lithium
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Fun Facts About… Lithium 1. Elemental Lithium can float in mineral oil!
2. Lithium was one of the elements produced during Big Bang Nucleosynthesis. The other tw...
WS Element of Month Sodium Boreal final
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1
All About Elements: Sodium
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Boreal’s All About Elements Series Building Real-World Connections to the Building Blocks of Chemistry
The periodic table of elements is an essential part of any chemistry ...
Biotite
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Biotite K (Mg, Fe+2)3 (Al, Fe+3) Si3 O10 (OH,F)2 (Mica Group) Crystallography: Monoclinic; 2/m. Usually in irregular foliated masses, and rarely in tabular or short prismatic crystals. Physical Properties:
Cle...
Element of Month Lithum Boreal
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1
All About Elements: Lithium
https://boreal.com/store/
boreal.com | 800-387-9393 2 3
Fun Facts About… Lithium 1. Elemental Lithium can float in mineral oil!
2. Lithium was one of the elements produced during Big Bang Nucleosynthesis. The other tw...
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