[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-348430-105":59,"doc-detail-348430-en":131},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","rock-identification-guide","Rock Identification Guide","","Rock Identification Guide provides a practical decision workflow to classify rocks by origin—igneous, sedimentary, or metamorphic—then confirm using grain size and hardness. It explains characteristic traits such as layering, foliation, fossils, and mineral types, and introduces the Mohs hardness scale with a scratch-test reference from talc to diamond. The guide also includes identification tables for each rock category, linking grain size, colour, composition, and diagnostic features to specific rock names.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":57,"@type":76,"position":81},"https://docshare.wps.com/document/general/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/rock-identification-guide/348430/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/rock-identification-guide/348430.png","ImageObject",300,407,{"name":92,"@type":93},"Emma Wilson","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-22","2026-09-22",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",12,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"How do you identify whether a rock is igneous, sedimentary, or metamorphic?","Question",{"text":113,"@type":114},"Start by comparing the rock’s overall character: igneous rocks are tough with little texture or layering; sedimentary rocks show strata, often with colour ranges and possible fossils or water/wind marks; metamorphic rocks are tough with foliation (straight or curved layers) and may contain mica or other distinctive minerals.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"What grain size and hardness clues help confirm a rock’s identification?",{"text":118,"@type":114},"Coarse grains are usually visible and minerals can often be identified without magnification, while fine grains usually require a magnifier. Hardness is assessed using the Mohs scale: harder rocks scratch glass and steel (often quartz or feldspar), mid-range rocks scratch fingernails, and very soft rocks may not scratch fingernails.",{"name":120,"@type":111,"acceptedAnswer":121},"How does the Mohs hardness scratch test work in this guide?",{"text":122,"@type":114},"The guide uses a relative scratch comparison: for example, talc is scrapeable with a fingernail, quartz scratches window glass, and diamond scratches corundum. Rock and mineral names are tied to these test outcomes in the provided table.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},348430,1791029274,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":56,"category_name":57,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":24,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":39},3848291630094,"https://eur-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","ROCK IDENTIFICATION GUIDE  \n1) Is it igneous, sedimentary or metamorphic?  \na. Igneous rocks such as granite or lava are tough, have little texture or layering. Rocks like these contain mostly black, white and/or grey minerals.  \nb. Sedimentary rocks such as limestone or shale are hardened sediment with sandy or clay-like layers (strata) . They are usually brown to grey in colour and may have fossils and water or wind marks.  \nc. Metamorphic rocks such as marble are tough, with straight or curved layers (foliation) of light and dark minerals. They come in various colours and often contain glittery mica.  \n2) Check the rock's grain size and hardness.  \na. Grain Size: Coarse grains are visible to the naked eye, and the minerals can usually be identified without using a magnifier. Fine grains are smaller and usually cannot be identified without using a magnifier.  \nb. Hardness: This is measured with the Mohs scale and refers to the  \nminerals contained within a rock. In simple terms, hard rock scratches glass and steel, usually signifying the minerals quartz or feldspar, which has a Mohs hardness of 6 or higher. Soft rock does not scratch steel but will scratch fingernails (Mohs scale of 3 to 5.5), while very soft rock won't even scratch fingernails (Mohs scale of 1 to 2) .  \nThe Mohs Hardness Scale  \n\n| Mineral | Mohs relative hardness scale | Scratch test |\n| --- | --- | --- |\n| Talc | 1 | Scrapeable with fingernail |\n| Gypsum | 2 | Scrapeable with fingernail |\n| Calcite | 3 | Scratch with copper coin |\n| Fluorite | 4 | Scratch with nail |\n| Apatite | 5 | Scratch with nail |\n| Feldspar | 6 | Scratch with steel file |\n| Quartz | 7 | Scratches window glass |\n| Topaz | 8 | Scratches glass |\n| Corundum | 9 | Scratches topaz |\n| Diamond | 10 | Scratches corundum |\n\nIgneous Rock Identification  \n\n| Grain Size | Usual Colour | Other | Composition | Rock Type |\n| --- | --- | --- | --- | --- |\n| fine | dark | glassy appearance | lava glass | Obsidian |\n| fine | light | many small bubbles | lava froth from sticky lava | Pumice |\n| fine | dark | many large bubbles | lava froth from fluid lava | Scoria |\n| fine or mixed | light | contains quartz | high-silica lava | Felsite |\n| fine or mixed | medium | between felsite and basalt | medium-silica lava | Andesite |\n| fine or mixed | dark | has no quartz | low-silica lava | Basalt |\n\n\n| mixed | any color | large grains in finegrained matrix | large grains of feldspar, quartz, pyroxene or olivine | Porphyry |\n| --- | --- | --- | --- | --- |\n| coarse | light | wide range of color and grain size | feldspar and quartz with minor mica, amphibole or pyroxene | Granite |\n| coarse | light | like granite but without quartz | feldspar with minor mica, amphibole or pyroxene | Syenite |\n| coarse | light to medium | little or no alkali feldspar | plagioclase and quartz with dark minerals | Tonalite |\n| coarse | medium to dark | little or no quartz | low-calcium plagioclase and dark minerals | Diorite |\n| coarse | medium to dark | no quartz; may have olivine | high-calcium plagioclase and dark minerals | Gabbro |\n| coarse | dark | dense; always has olivine | olivine with amphibole and/or pyroxene | Peridotite |\n| coarse | dark | dense | mostly pyroxene with olivine and amphibole | Pyroxenite |\n| coarse | green | dense | at least 90 percent olivine | Dunite |\n| very coarse | any color | usually in small intrusive bodies | typically granitic | Pegmatite |\n\nSedimentary Rock Identification  \n\n| Hardness | Grain Size | Composition | Other | Rock Type |\n| --- | --- | --- | --- | --- |\n| hard | coarse | clean quartz | white to brown | Sandstone |\n| hard | coarse | quartz and feldspar | usually very coarse | Arkose |\n| hard or soft | mixed | mixed sediment with rock grainsand clay | gray or dark and\"dirty\" | Wacke/ Graywacke |\n| hard or soft | mixed | mixed rocks and sediment | round rocks in finer sediment matrix | Conglomerate |\n| hard or soft | mixed | mixed rocks and sediment | sharp pieces in finer sediment ma","cbCaiftRg4fRbqMh","https://ap.wps.com/l/cbCaiftRg4fRbqMh","pdf",72436,"English","# Rock Type Classification\n## Igneous rocks\n## Sedimentary rocks\n## Metamorphic rocks\n# Grain Size and Hardness\n## Grain size\n## Hardness (Mohs scale)\n## Mohs Hardness Scale Table\n# Rock Identification by Type\n## Igneous Rock Identification\n## Sedimentary Rock Identification\n## Metamorphic Rock Identification","[{\"question\":\"How do you identify whether a rock is igneous, sedimentary, or metamorphic?\",\"answer\":\"Start by comparing the rock’s overall character: igneous rocks are tough with little texture or layering; sedimentary rocks show strata, often with colour ranges and possible fossils or water/wind marks; metamorphic rocks are tough with foliation (straight or curved layers) and may contain mica or other distinctive minerals.\"},{\"question\":\"What grain size and hardness clues help confirm a rock’s identification?\",\"answer\":\"Coarse grains are usually visible and minerals can often be identified without magnification, while fine grains usually require a magnifier. Hardness is assessed using the Mohs scale: harder rocks scratch glass and steel (often quartz or feldspar), mid-range rocks scratch fingernails, and very soft rocks may not scratch fingernails.\"},{\"question\":\"How does the Mohs hardness scratch test work in this guide?\",\"answer\":\"The guide uses a relative scratch comparison: for example, talc is scrapeable with a fingernail, quartz scratches window glass, and diamond scratches corundum. Rock and mineral names are tied to these test outcomes in the provided table.\"}]","Rock Identification Guide | PDF",1790073224]