{"id":730,"date":"2020-09-15T15:06:49","date_gmt":"2020-09-15T19:06:49","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/?post_type=chapter&p=730"},"modified":"2021-09-24T16:54:33","modified_gmt":"2021-09-24T20:54:33","slug":"reference-tools-for-igneous-rocks","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/chapter\/reference-tools-for-igneous-rocks\/","title":{"raw":"Reference Tools for Igneous Rocks","rendered":"Reference Tools for Igneous Rocks"},"content":{"raw":"

What's in This Toolbox?<\/h1>\r\n

Igneous Rock Identification Flowchart<\/h3>\r\nUse this flowchart to guide you through deciding on a rock name. Note that this chart may include some rocks that are not in your kit.\r\n\r\nGo to the Igneous Rock ID Flowchart<\/a>.\r\n

Mafic Colour Index (MCI) Chart<\/h3>\r\nUse this diagram to help you estimate the percent of mafic (dark grey, black, and\/or green) minerals.\r\n\r\nGo to the MCI Chart<\/a>.\r\n

Compositional Classification Diagram<\/h3>\r\nA colour diagram showing the mineral breakdown of common igneous rocks, including photographs of the common types of rocks in each of the compositional categories (i.e., ultramafic, mafic, intermediate, felsic). Use this diagram to remind yourself about the different colours of igneous rocks, and the difference between phaneritic (coarse-grained) and aphanitic (fine-grained) textures.\r\n\r\nNote: This diagram is from the textbook<\/a>.\r\n\r\nGo to the Compositional Classification Diagram<\/a>.\r\n\r\n
\r\n\r\n

<\/a>Igneous Rock Identification Flowchart<\/h2>\r\n[caption id=\"attachment_769\" align=\"alignnone\" width=\"1024\"]\"\"<\/a> Figure 3.10 |<\/strong> Flowchart for choosing an igneous rock name. Download the flowchart as a pdf file<\/a>. Source: Stuart MacKinnon (CC BY-NC-SA)[\/caption]\r\n

<\/a>Mafic Colour Index (MCI) Chart<\/h2>\r\nThis diagram shows the percent of each circle covered by specs that represent minerals.\u00a0 Dark minerals in a lighter background are shown on the left, and light minerals in a darker background are shown on the right. Note that the Light Minerals<\/em> column is the negative of the Dark Minerals<\/em> column, meaning that a coverage of 30% light minerals has 70% coverage of dark minerals.\r\n\r\n[caption id=\"attachment_774\" align=\"alignnone\" width=\"768\"]\"\"<\/a> FIgure 3.11 |<\/strong> Chart to aid in estimating the percent of a particular mineral in a rock. Download this chart as a PDF file<\/a>. Source: Karla Panchuk (2020) CC BY-NC-SA. Modified after Shvetsov (1954) and Terry & Chilingar (1955).[\/caption]\r\n

<\/a>Compositional Classification Diagram<\/h2>\r\n[caption id=\"attachment_1269\" align=\"alignnone\" width=\"1024\"]\"\"<\/a> Figure 3.12 |<\/strong> Classification diagram for igneous rocks. Igneous rocks are classified according to the relative abundances of minerals they contain. A given rock is represented by a vertical line in the diagram. In the mafic field, the arrows represent a rock containing 60% pyroxene and 40% olivine. The name an igneous rock gets depends not only on composition, but on whether it is intrusive or extrusive. Source: Karla Panchuk (2018) CC BY-NC-SA 4.0. Click for more attributions.<\/a>[\/caption]","rendered":"

What’s in This Toolbox?<\/h1>\n

Igneous Rock Identification Flowchart<\/h3>\n

Use this flowchart to guide you through deciding on a rock name. Note that this chart may include some rocks that are not in your kit.<\/p>\n

Go to the Igneous Rock ID Flowchart<\/a>.<\/p>\n

Mafic Colour Index (MCI) Chart<\/h3>\n

Use this diagram to help you estimate the percent of mafic (dark grey, black, and\/or green) minerals.<\/p>\n

Go to the MCI Chart<\/a>.<\/p>\n

Compositional Classification Diagram<\/h3>\n

A colour diagram showing the mineral breakdown of common igneous rocks, including photographs of the common types of rocks in each of the compositional categories (i.e., ultramafic, mafic, intermediate, felsic). Use this diagram to remind yourself about the different colours of igneous rocks, and the difference between phaneritic (coarse-grained) and aphanitic (fine-grained) textures.<\/p>\n

Note: This diagram is from the textbook<\/a>.<\/p>\n

Go to the Compositional Classification Diagram<\/a>.<\/p>\n

\n

<\/a>Igneous Rock Identification Flowchart<\/h2>\n
\"\"<\/a>
Figure 3.10 |<\/strong> Flowchart for choosing an igneous rock name. Download the flowchart as a pdf file<\/a>. Source: Stuart MacKinnon (CC BY-NC-SA)<\/figcaption><\/figure>\n

<\/a>Mafic Colour Index (MCI) Chart<\/h2>\n

This diagram shows the percent of each circle covered by specs that represent minerals.\u00a0 Dark minerals in a lighter background are shown on the left, and light minerals in a darker background are shown on the right. Note that the Light Minerals<\/em> column is the negative of the Dark Minerals<\/em> column, meaning that a coverage of 30% light minerals has 70% coverage of dark minerals.<\/p>\n

\"\"<\/a>
FIgure 3.11 |<\/strong> Chart to aid in estimating the percent of a particular mineral in a rock. Download this chart as a PDF file<\/a>. Source: Karla Panchuk (2020) CC BY-NC-SA. Modified after Shvetsov (1954) and Terry & Chilingar (1955).<\/figcaption><\/figure>\n

<\/a>Compositional Classification Diagram<\/h2>\n
\"\"<\/a>
Figure 3.12 |<\/strong> Classification diagram for igneous rocks. Igneous rocks are classified according to the relative abundances of minerals they contain. A given rock is represented by a vertical line in the diagram. In the mafic field, the arrows represent a rock containing 60% pyroxene and 40% olivine. The name an igneous rock gets depends not only on composition, but on whether it is intrusive or extrusive. Source: Karla Panchuk (2018) CC BY-NC-SA 4.0. Click for more attributions.<\/a><\/figcaption><\/figure>\n","protected":false},"author":1019,"menu_order":3,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-730","chapter","type-chapter","status-publish","hentry"],"part":63,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/wp-json\/pressbooks\/v2\/chapters\/730","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/wp-json\/wp\/v2\/users\/1019"}],"version-history":[{"count":20,"href":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/wp-json\/pressbooks\/v2\/chapters\/730\/revisions"}],"predecessor-version":[{"id":1270,"href":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/wp-json\/pressbooks\/v2\/chapters\/730\/revisions\/1270"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/wp-json\/pressbooks\/v2\/parts\/63"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/wp-json\/pressbooks\/v2\/chapters\/730\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/wp-json\/wp\/v2\/media?parent=730"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/wp-json\/pressbooks\/v2\/chapter-type?post=730"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/wp-json\/wp\/v2\/contributor?post=730"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/geolmanual\/wp-json\/wp\/v2\/license?post=730"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}