Millstone Mountain

{{Short description|Mountain in Northern Ireland}}

{{Use dmy dates|date=April 2022}}

{{Infobox mountain

| name = Millstone Mountain

| other_name =

| photo =File:The Mourne Mountains From Newcastle Beach - geograph.org.uk - 1189219.jpg

| photo_caption =Millstone Mountain, located on the far left

| photo_size =

| map =Northern Ireland

| map_alt =Location of Millstone Mountain within Northern Ireland

| map_caption = Location of Millstone Mountain within Northern Ireland

| elevation_m =460

| elevation_ref = {{cite web | url=https://mountainviews.ie/summit/584/ | title=Mourne Mountains Area - Millstone Mountain | publisher=Mountain Views | accessdate=19 March 2019}}

| prominence_m =25

| prominence_ref =

| listing =

| translation =

| language =

| location = County Down, Northern Ireland

| range = Mournes

| coordinates = {{coord|54.1883|N|5.8985|W|type:mountain_scale:100000|format=dms|display=inline,title}}

| coordinates_ref =

| grid_ref_Ireland = J37291 28507

| topo = OSNI Discoverer 29

}}

Millstone Mountain is a hill in the Mourne Mountains in County Down, Northern Ireland. It is the most easterly peak in the Mournes and, along with Thomas Mountain and Crossone, is one of the three subsidiary peaks of Slieve Donard.{{Cite web |url=http://www.mourne-mountains.com/mournes/mountains/slieve-donard/ |title=Slieve Donard |website=www.mourne-mountains.com |access-date=19 March 2019}}

Millstone was produced in the area in the past and there are two former sites to the south-west and north-west of the summit.{{Cite journal |last=Wilson |first=Peter |title=An Unusual Stone 'Structure' on Slieve Donard |journal=Archaeology Ireland |volume=26 |issue=4 |pages=26–30|jstor=23321596 |year=2012 }} A granite quarry was opened on the northern side of the mountain in 1824 and a funicular railway, known as the Bogie Line, ran from it to King Street. The railway was diverted to the nearby quarry on Thomas Mountain in 1959. Both quarries are abandoned and the path of the Bogie Line is now a walking trail known as The Granite Trail.{{Cite news |url=https://www.belfasttelegraph.co.uk/life/weekend/walk-of-the-week-the-granite-trail-28727731.html |title=Walk of the Week: The Granite Trail |date=19 March 2012 |newspaper=Belfasttelegraph.co.uk |access-date=19 March 2019}}