
Khondalite is a
foliated metamorphic rock
Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock ( protolith) is subjected to temperatures greater than and, often, elevated pressure of or more, caus ...
. In India, it is also called ''Bezwada Gneiss'' and ''Kailasa Gneiss''.
It was named after the
Khond tribe of
Odisha
Odisha (), formerly Orissa (List of renamed places in India, the official name until 2011), is a States and union territories of India, state located in East India, Eastern India. It is the List of states and union territories of India by ar ...
and
Andhra Pradesh
Andhra Pradesh (ISO 15919, ISO: , , AP) is a States and union territories of India, state on the East Coast of India, east coast of southern India. It is the List of states and union territories of India by area, seventh-largest state and th ...
because well-formed examples of the rock were found in the inhabited hills of these regions of eastern
India
India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...
.
Distribution

Khondalite is found in the
Eastern Ghats
The Eastern Ghats is a mountain range that stretches along the East Coast of India, eastern coast of the Indian peninsula. Covering an area of , it traverses the states and union territories of India, states of Odisha, Telangana, Andhra Prade ...
between
Vijayawada
Vijayawada ( ), formerly known by its colonial name Bezawada, is the second largest city and a major commercial hub in the Andhra Pradesh state of India. The city forms an integral part of the Andhra Pradesh Capital Region and is situated on th ...
and
Cuttack
Cuttack (, or officially Kataka in Odia language, Odia ), is the former capital, deputy capital and the 2nd largest city of the Indian state of Odisha. It is also the headquarters of the Cuttack district. The name of the city is an anglicised f ...
in India.
but the term khondalite is also used to describe other rocks of similar composition found elsewhere in India as well as in
Burma
Myanmar, officially the Republic of the Union of Myanmar; and also referred to as Burma (the official English name until 1989), is a country in northwest Southeast Asia. It is the largest country by area in Mainland Southeast Asia and ha ...
,
Sri Lanka
Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, also known historically as Ceylon, is an island country in South Asia. It lies in the Indian Ocean, southwest of the Bay of Bengal, separated from the Indian subcontinent, ...
,
the northeastern Helanshan region
and the
Inner Mongolia
Inner Mongolia, officially the Inner Mongolia Autonomous Region, is an Autonomous regions of China, autonomous region of China. Its border includes two-thirds of the length of China's China–Mongolia border, border with the country of Mongolia. ...
region of China.
Composition
Khondalite is
quartz
Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The Atom, atoms are linked in a continuous framework of SiO4 silicon–oxygen Tetrahedral molecular geometry, tetrahedra, with each oxygen being shared between two tet ...
–
manganese
Manganese is a chemical element; it has Symbol (chemistry), symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese was first isolated in the 1770s. It is a transition m ...
-rich
garnet
Garnets () are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives.
Garnet minerals, while sharing similar physical and crystallographic properties, exhibit a wide range of chemical compositions, de ...
–
rhodonite schist
Schist ( ) is a medium-grained metamorphic rock generally derived from fine-grained sedimentary rock, like shale. It shows pronounced ''schistosity'' (named for the rock). This means that the rock is composed of mineral grains easily seen with a l ...
.
It may also contain
sillimanite
Sillimanite or fibrolite is an aluminosilicate mineral with the chemical formula Al2SiO5. Sillimanite is named after the American chemist Benjamin Silliman (1779–1864). It was first described in 1824 for an occurrence in Chester, Connecticut ...
and
graphite
Graphite () is a Crystallinity, crystalline allotrope (form) of the element carbon. It consists of many stacked Layered materials, layers of graphene, typically in excess of hundreds of layers. Graphite occurs naturally and is the most stable ...
.
Feldspar
Feldspar ( ; sometimes spelled felspar) is a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. The most common members of the feldspar group are the ''plagiocl ...
may occur in some cases.
Formation
Khondalites are considered to be
metasedimentary rocks formed during Archaean era. According to
Lewis Leigh Fermor, the khondalite and the related
charnockite of the Eastern Ghat region were formed when the Eastern Ghat belt was faulted and buried. It was uplifted later, bringing these metamorphic rocks to the surface.
Use
Khondalites weather easily but still have been used in buildings and temples, for example, the
Konark Sun Temple and
Jagannath Temple
The Jagannath Temple is a Hindu temple dedicated to the god Jagannath, a form of Vishnu in Hinduism. It is located in Puri in the state of Odisha, situated on the eastern coast of India. As per temple records, King Indradyumna of Avanti (reg ...
.
See also
*
Gneiss
Gneiss (pronounced ) is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. This rock is formed under p ...
*
Charnockite
References
Gneiss
Metamorphic rocks
Geology of India
Geology of Andhra Pradesh
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