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Types of Flint

Basalt
Basalt

Basalt Basalt is a fine-grained, silica-poor, igneous rock and is by far the most abundant volcanic rock. It ranges from black to dark gray in color. Most basalts occur in lava flows and sheets. Basalt is very difficult to knapp.

source: thudscave.com
Granite
Granite

is that flint is a hard, fine-grained quartz that fractures conchoidally and generates sparks when struck while granite is a group of igneous and plutonic rocks composed primarily of feldspar and quartz usually contains one or more dark minerals, which may be mica, pyroxene, or amphibole granite is quarried for building stone, road gravel, decorative stone, and tombstones common colors are gray, white, pink, and yellow-brown.

source: wikidiff.com
Limestone
Limestone

A thin layer on the outside of the nodules is usually different in colour, typically white and rough in texture. From a petrological point of view, "flint" refers specifically to the form of chert which occurs in chalk or marly limestone.

Marble
Marble

Find answers for the crossword clue: Flint or marble . We have 3 answers for this clue.

image: etsy.com
Quartzite
Quartzite

Quartzite (from German: Quarzit) is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone. Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts.

image: geology.com
Sandstone
Sandstone

sandstone is not harder than flint because sandstone breaks in to smaller pieces.

source: answers.com
Slate
Slate

Flint is a hard, sedimentary cryptocrystalline form of the mineral quartz, categorized as a variety of chert. It occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones.