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Rock describes an inorganic material that is an aggregate, or mixture, of minerals. Rocks are igneous, metamorphic, sedimentary or in rare cases extraterrestrial (meteorites and some tektites).

Rock Polished
Rock Classification
Common Name Rock
Species Rock
Rock Optical Properties
Transparency Opaque-Translucent
Optic Character NA
Optic Sign NA
Polariscope Reaction Aggregate (AGG)
Pleochroism None
Rock Characteristic Physical Properties
Luster Dull, Resinous, Vitreous, Submetallic, Silky, Pearly, Metallic, Greasy
Rock Chemistry & Crystallography
Chemistry Classification Rock

Rock Colors

  • Bi-color Rock Bi-color
  • Yellow Rock Yellow
  • White Rock White
  • Red Rock Red
  • Purple Rock Purple
  • Pink Rock Pink
  • Orange Rock Orange
  • Multi-color Rock Multi-color
  • Green Rock Green
  • Gray Rock Gray
  • Brown Rock Brown
  • Blue Rock Blue
  • Black Rock Black

Alternate Names

Mixed Ornamental Stone

Countries of Origin

Niger (the); Papua New Guinea; Cambodia; Gambia (the); Kazakhstan; Paraguay; Solomon Islands; Montserrat; Unknown; Mali; Guadeloupe; Panama; Bonaire, Sint Eustatius and Saba; Argentina; Seychelles; Belize; Zambia; Bahrain; Guinea-Bissau; Saint Barthelemy; Namibia; Finland; Georgia; Yemen; Tanzania, United Republic Of; Eritrea; Puerto Rico; Viet Nam; Aruba; Madagascar; Libya; Sweden; Malawi; Andorra; Saint Helena, Ascension and Tristan da Cunha; Liechtenstein; Russian Federation (the); Poland; Bulgaria; Jordan; United States Minor Outlying Islands (the); Tunisia; Tuvalu; Kenya; French Polynesia; Djibouti; Lebanon; Azerbaijan; Cuba; Mauritania; Saint Lucia; Guernsey; Congo (the Democratic Republic of the); Mayotte; Israel; San Marino; Australia; Tajikistan; Myanmar; Cameroon; Gibraltar; Cyprus; Malaysia; Iceland; Oman; Bosnia And Herzegovina; Armenia; Gabon; Korea (the Republic of); Luxembourg; Brazil; Algeria; Cabo Verde; Jersey; Slovenia; Colombia; Ecuador; Iran (Islamic Republic of); United States of America (the); Vanuatu; Honduras; Italy; Antarctica; Turks and Caicos Islands (the); Nauru; Haiti; Afghanistan; Burundi; British Indian Ocean Territory (the); Singapore; French Guiana; American Samoa; Christmas Island; China; Martinique; Sudan (the); Kyrgyzstan; Comoros (the); United Kingdom of Great Britain and Northern Ireland (the); Reunion; Saint Pierre And Miquelon; Cote D'Ivoire; Bhutan; Multiple; Romania; Togo; Cocos (Keeling) Islands (the); Dominican Republic (the); Uzbekistan; Holy See (the); Netherlands (the); Pitcairn; Zimbabwe; Montenegro; Dominica; Indonesia; Benin; Angola; Virgin Islands (British); Brunei Darussalam; Portugal; New Caledonia; Grenada; Moldova (the Republic of); Greece; Latvia; Mongolia; Morocco; Guatemala; Guyana; Iraq; Chile; Nepal; Cayman Islands (the); Isle of Man; Ukraine; Ghana; Anguilla; Saint Vincent And The Grenadines; India; Canada; Maldives; Turkey; Belgium; Faroe Islands (the); South Africa; Bermuda; Aland Islands; Jamaica; Peru; Turkmenistan; Venezuela (Bolivarian Republic of); Germany; United Arab Emirates (the); Fiji; Tokelau; Hong Kong; Guinea; Chad; Somalia; Thailand; Cook Islands (the); Equatorial Guinea; Kiribati; Costa Rica; Saint Martin (French part); Kuwait; Nigeria; Central African Republic (the); Palestine, State of; Croatia; Sao Tome And Principe; Syrian Arab Republic; Sri Lanka; Uruguay; Timor-Leste; Switzerland; Samoa; Spain; Liberia; Burkina Faso; Swaziland; Lao People's Democratic Republic (the); Palau; Estonia; Wallis and Futuna; Niue; Svalbard And Jan Mayen; Austria; Mozambique; El Salvador; Monaco; Guam; Lesotho; Tonga; Heard Island And Mcdonald Islands; Western Sahara; Hungary; Republic of Kosovo; South Sudan; Congo (the); Japan; Belarus; Curacao; Mauritius; Taiwan (Province of China); Bouvet Island; Albania; Bolivia (Plurinational State of); Norfolk Island; Trinidad And Tobago; Virgin Islands (U.S.); New Zealand; Sint Maarten (Dutch part); Senegal; Micronesia (Federated States of); Ethiopia; Macedonia (the former Yugoslav Republic of); Czechia; Egypt; Falkland Islands (the) [Malvinas]; Marshall Islands (the); Sierra Leone; Malta; Saudi Arabia; South Georgia And The South Sandwich Islands; Pakistan; Ireland; Qatar; Slovakia; France; Lithuania; Serbia; Bahamas (the); French Southern Territories (the); Rwanda; Saint Kitts And Nevis; Bangladesh; Barbados; Nicaragua; Norway; Botswana; Macao; Denmark; Mexico; Northern Mariana Islands (the); Uganda; Suriname; Philippines (the); Greenland; Antigua And Barbuda

Sisk Gemology Reference

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Copper Porphyry

Copper Porphyry Rock
Copper Porphyry Classification
Common Name Copper Porphyry
Copper Porphyry Optical Properties
Refractive Index Over The Limit 1.46-1.909
Fluorescence SWUV: Inert
LWUV: Inert to weak greenish yellow
Copper Porphyry Characteristic Physical properties
Specific Gravity 2
Stability Poor


Jenekite is a trade name for an amphibole-rich metamorphic rock that is also called, Nuummite.Nuummite is named after its place of origin: Nuuk, Greenland.This rock is frequently polished en cabochon and produces an attractive iridescence caused by interlocking crystals of anthophyllite and gedrite.

Jenekite Rock
Jenekite Classification
Common Name Jenekite
Jenekite Optical Properties
Refractive Index 1.649-1.669
Birefringence .022
Fluorescence SWUV: Inert
LWUV: Inert
Jenekite Characteristic Physical properties
Specific Gravity 2.93
Inclusions Jenekite will contain Iridescent anthophyllite needles.

Eilat Stone

The rich greens of eilat stone comes from it being a unique combination of various copper-bearing minerals including chrysocolla, malachite, azurite and turquoise. This stone is the national stone of Israel and known as King Solomon stone, as it comes from what is storied as King Solomon's mines in the Timna Valley of Israel.

Eilat Stone Rock
Eilat Stone Classification
Common Name Eilat Stone
Eilat Stone Optical Properties
Dispersion Strength: none
Refractive Index 1.5-1.61
Birefringence .025
Fluorescence SWUV: Inert
LWUV: Inert
Eilat Stone Characteristic Physical properties
Specific Gravity 2.8
Inclusions Eilat stone has a variegated and mottled appearance.
Tim Matthews


Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.